Ask questions about the math 1-4 chapter, science 1 chapter, and the second chapter 1-2 section.

A, multiple-choice questions (this question has 20 small questions, each with 4 points and ***80 points. Please choose a correct option that matches the meaning of each question, and they will not be deducted.

1. From the scientific knowledge learned, which of the following advertising terms is correct?

This drink does not contain any chemicals.

There is no life without water.

C. The ammonium bicarbonate produced by our factory contains more than 50% nitrogen, with high nitrogen content and low price, which is a good helper for farmers to increase their income and get rich.

D "××" brand vegetables, planted naturally, do not contain any chemical elements, and are truly green foods.

2. There are many kinds of creatures on the earth, and the basic units (except viruses) that make up the biological structure are all

A. tissue b, organ c, cell d system

3. As shown in the figure, there are three pomelo trees with equal mass, namely A, B and C, and their positions are different, so which one has the largest gravitational potential energy?

Motion Picture Association of America.

C, c and d are the same size.

4. Put the following four kinds of condiments commonly used in families into water respectively, and some of them can't form a solution.

A. acetic acid B. sucrose C. salt D. sesame oil

5. The little hero in the movie "Daddy's Love" got leukemia. He had to rely on blood transfusion to maintain his life until he found a matching bone marrow transplant. If the hero's blood type is A, what blood type should he lose?

A, B, D, D, D, Ding Ding.

6. The car was driving on a horizontal highway at a speed of 80 km/h, and when it braked suddenly, two tire scratches were left on the road. The following statement is correct.

A. the longer the scratch, the smaller the inertia of the car.

B. the longer the scratch, the slower the speed.

These scratches are caused by the increased friction between the wheel and the ground after braking.

D. mechanical energy conservation during braking.

7. Water resources are renewable resources. In the water cycle, they constantly move between the atmosphere and the surface. The figure shows a part of the water cycle, and the places marked with X, Y and Z in the figure represent the three stages of the water cycle. The following statement is correct.

A.x stage is evaporation, Y stage is condensation and Z stage is precipitation.

B.x stage is transpiration, Y stage is condensation and Z stage is precipitation.

C.x stage is condensation, Y stage is evaporation and Z stage is solidification.

The D. X stage is precipitation, the y stage is transpiration and the z stage is condensation.

8. Popsicles will slowly turn into water in your mouth. This process is:

A. liquefaction B. vaporization C. melting D. curing

9. China has promulgated the Classification Signs of Municipal Domestic Waste, some of which are shown in the figure. What kind of sign should the existing waste fluorescent tubes and batteries be put into the garbage collection box?

10. As the saying goes, "As you sow, you reap." It is a fact that some people have eyes like their fathers and noses like their mothers. So the genetic material that controls biological characteristics is

A. Chromosome B gene C. DNA D protein

1 1. Due to the lack of scientific common sense, casualties occur from time to time. The following practice is correct.

A For household appliances with a metal shell, the grounding wire of the shell can be connected to the zero line of the power supply.

B. Don't touch the low-voltage charged body and stay away from the high-voltage charged body.

C. When diluting concentrated sulfuric acid, directly pour water into concentrated sulfuric acid.

D when the electrical equipment is on fire, use water to extinguish the fire first, and then cut off the power supply.

12. Biological reproduction can be divided into sexual reproduction and asexual reproduction. The following individuals are formed through sexual reproduction.

A. cloned sheep B. wheat seedlings in tissue culture

C. Grafted citrus test-tube baby

13. There are many kinds of levers. The following are labor-saving bars.

A. bottle opener B. fishing rod C. human forearm D. crown block

14. There are many kinds of seeds in pumpkin, because there are many kinds of seeds in a female flower of pumpkin.

A. pollen b ovule c ovary d pistil

15. Disinfection of fresh water in rivers and lakes with sodium ferrite (Na2FeO4) is a new technology for urban drinking water treatment. In Na2FeO4, the valence of oxygen is -2, that of sodium is+1, and that of iron is.

A.+2 B.+3 C.+5 D.+6

16. In the following cases, atmospheric pressure is not applied.

A. drink through a straw. B. pump water.

C, sucking the chemical reagent with a rubber dropper D, injecting the liquid medicine in the needle tube of the syringe into the human body.

17. There are many "equality" in scientific knowledge. Please judge which of the following statements is incorrect.

A. Mix 100 volume of water and 100 volume of alcohol, and the volume of the obtained mixed solution is equal to 200 volume.

B. The currents in the series circuit are equal everywhere.

C. After mixing dilute hydrochloric acid and sodium hydroxide solution, the quality of the obtained solution is equal to the total quality of the solution before the reaction.

In chemical reactions, the atomic species and total number of reactants are equal to those of products.

18. The constant body temperature is mainly the result of the dynamic balance between heat production and heat dissipation. The following is a statistical chart of heat production of students A and B, according to which we can judge their situation.

A.a is in a quiet state and B is in a moving state. B. A and b are both in a quiet state.

C.A. is exercising and B. is quiet. D and B are both moving.

19. The earth is a member of the solar system, and solar activities affect the climate, hydrology, geology and even human life on the earth to varying degrees. The following can be used as a sign of the strength of solar activity.

A. corona B. sunspot C. prominence D. solar wind

20. Lighting lamps and ventilation fans should be installed in the bathrooms of ordinary families. In use, sometimes you need to work independently, and sometimes you need to work at the same time. Evaluate the circuit shown in the figure below. What do you think meets the above requirements?

Two, short answer (this question has 10 small questions, 20 spaces, each space 3 points, ***60 points)

2 1. The human digestive system consists of digestive tract and digestive glands. Seven nutrients in food must be digested and absorbed by the digestive system before they can enter the blood, and nutrients can be transported to all tissues of the whole body through blood circulation.

(1) The main place for food digestion and absorption is ▲.

(2) Blood flows through the heart twice in a complete blood circulation process, which can be divided into systemic circulation and ▲.

22. Models are often used to show that molecules are composed of atoms. If "●" stands for oxygen atom and "○" stands for hydrogen atom, then "○" stands for ▲ molecule.

23. The sun and the moon are the most important neighbors of the earth in the universe. The moon moves around the earth, which makes the relative positions of the sun, the earth and the moon change regularly within one month, thus resulting in moon phase changes.

(1) The moon phase of Mid-Autumn Festival is ▲.

A. new moon B. full moon C. first quarter moon D. second quarter moon

(2) The moon is the first stop for human beings to explore the universe, and China is also developing the technology of landing on the moon. Scientists found that there is no air, water and life on the moon, and its surface is covered with large and small.

24. As shown in the picture, the jar was filled with a proper amount of clarified limewater, and a green plant was put in it. It was stuffed with a cork and left in the dark for a long time, and it was found that the clarified limewater became turbid. This is because the gas in the bottle reacts with Ca(OH)2, which is released mainly through the action of plants.

25. The picture shows some small experiments made by students in a study group in inquiry learning. Please answer:

In the experiment of (1) voltammetric resistance measurement, if the number of currents is as shown in Figure A, the current is ▲ A. ..

(2) As shown in Figure B, fix a thin metal tube with a closed bottom on the table top, add some ether and plug it tightly. Wrap a rope around the pipe and pull the rope back and forth quickly, and we will see the rubber plug jump up. When the rubber plug jumps, it can be converted into mechanical energy.

(3) As shown in Figure C, hold one end of two pieces of paper with both hands and hang them on your chest. When blowing down along the middle of two sheets of paper, I saw the two sheets of paper moving closer to the middle. The reasonable explanation for this phenomenon is: ▲ (choose "A" or "B").

A. the greater the gas velocity, the greater the air pressure. B the air pressure between two sheets of paper is less than the air pressure outside the paper.

26. Quzhou Daily reported that on March 10, 2006, Zhejiang Juhua Co., Ltd. (hereinafter referred to as "Juhua Co., Ltd.") helped Juhua Co., Ltd. to carry out environmental protection technological transformation for free in order to welcome JMD multinational companies, and purchased all the reduced carbon dioxide emission rights. This project is by far the largest trading of carbon dioxide emission rights in the world. In order to protect the earth on which human beings depend, according to the relevant requirements of Kyoto Protocol, various measures and new technologies have been adopted all over the world to limit CO2 emission and control the increasingly serious greenhouse effect. Please answer the following questions:

(1) Scientists use the technology of "component transformation" to mix CO2 and H2 in a certain proportion and react under certain conditions to generate an important chemical raw material and water. The chemical equation of the reaction is 2CO2+6H2→X+4H2O. Please write the chemical formula of x ▲.

(2) In order to slow down the increase of CO2 content in the atmosphere, in the following suggestions, it is feasible at present (fill in the serial number).

(1) A large number of trees are planted, and deforestation is prohibited.

② Bus uses compressed natural gas (mainly methane (CH4)) as fuel, which can fundamentally avoid the greenhouse effect.

③ Make more use of nuclear energy, solar energy, wind energy and geothermal energy.

(4) It is forbidden to use coal, oil and other mineral energy sources.

27. As shown in the figure, it is an experimental circuit diagram to study the magnetic field around the energized solenoid.

(1) To change the current in the energized solenoid coil, you can change it by ▲;

(2) Judging the strength of the magnetic field around the energized solenoid can be determined by observation.

28. Developing ecological agriculture is one of the important contents of building a new socialist countryside. A young farmer, with the help of resident cadres, established a small-scale agricultural ecosystem in his garden: mushrooms were planted on the ground, box earthworms were raised in the air, and grapes were planted on them. At the same time, earthworm is used to raise chickens, chicken manure is fed to pigs, pig manure is collected in biogas digesters, biogas is used as fuel, biogas residue is used as fertilizer, and material resources are realized to the maximum extent.

(1) In this ecosystem, mushrooms and earthworms belong to ▲ (fill in "producer", "decomposer" or "consumer")

(2) In the process of energy flow in the ecosystem, the fixation of solar energy by biological communities is completed through the role of ▲.

29. A classmate helps the lab teacher clean. When cleaning two equal-volume balls A and B, it is found that they are still in the water and are in the state as shown in the figure. At this time, the buoyancy of ball A ▲ the buoyancy of ball B (fill in "greater than", "equal to" or "less than").

30. Some interesting tricks can be performed by using scientific principles.

(1) White flowers turn into red flowers. Spray colorless solution A first, then colorless solution B on the white paper flowers, and the white flowers will immediately become red flowers. If solution A is colorless phenolphthalein, then b is ▲ (fill in serial number: ① dilute hydrochloric acid ② sodium hydroxide solution ③ salt solution).

(2) "Clear water" is changed into "milk". In colorless liquid C, five-color liquid B is poured in and left to stand, resulting in "milk"-like white precipitate. If C is dilute sulfuric acid, then B is ▲ (fill in serial number: ① sodium hydroxide solution ② barium chloride solution ③ sodium chloride solution), in which the basic type of chemical reaction is ▲.

Third, the experimental inquiry question (this question has 3 small questions, the third1small question 9 points, the 32nd small question 9 points, the 33rd small question 10 points, ***28 points).

3 1. In the construction of modern agricultural demonstration zone, a county has realized factory seedling raising, and the key to improve the germination rate of factory seedling raising is to determine the most suitable seedling raising conditions. In order to find out the most suitable temperature for germination of an excellent rice variety, a team learned the highest temperature (40℃) and the lowest temperature (10℃) for germination of common seeds through consulting, and then selected seven temperature points between them to carry out experiments. Seven identical experimental devices (as shown in Figure A) were placed in the corresponding temperature environment (other conditions being the same), and the seeds germinated after growing at different temperatures for seven days.

Temperature (℃) 10 15 20 25 30 35 40

The germination rate is 10% 20% 60% 85% 80% 45% 30%.

(1) According to the experimental data, the optimum temperature of this rice seed is about ▲.

(2) In addition to the influence of temperature on seed germination rate, please write another external factor that affects seed germination according to your knowledge ▲

(3) Do you think that the nutrients needed in the process of rice seed germination are provided by▲ (filling "endosperm" or "cotyledon")?

32. In the experiment of observing the transformation of kinetic energy and potential energy when the ball swings (as shown in the figure), Xiaoke found that the time for each round trip of the ball seems to be equal. So Xiao Ke thought of such a question: What factors are related to the time required for the ball to swing back and forth once (called period T)?

Guess ①: It may be related to the amplitude of the ball swing;

Guess ②: It may be related to the quality of the ball;

Guess ③: It may be related to the length of the rope.

In order to verify his conjecture, Xiao can measure the time required for the ball to swing back and forth many times under different conditions with a stopwatch, and calculate the time required for an average swing. Please answer:

(1) The average value can be obtained by measuring the time of the ball swinging back and forth many times, instead of measuring the time of the ball swinging back and forth once to determine the period t, in order to bring.

(2) In order to verify whether the conjecture ② is correct, Xiaoke prepared a stopwatch and a scale, and lacked a measuring instrument commonly used in the laboratory. Its name is ▲.

(3) A large number of experiments show that the time t for the ball to swing at the same place is only related to the length of the rope, and the longer the rope, the longer the period t. The pendulum clock is made according to this principle. Once Xiaoke found that the pendulum clock at home was slow. To adjust correctly, you can change the swing length ▲ (select "Adjust Length" or "Adjust Length").

33. The scientific interest group of a school took the following experimental steps when studying the topic "The relationship between the reburning of Mars with wooden strips and the oxygen volume fraction":

(1) Take five 250ml gas cylinders, put 25ml, 50ml, 75ml, 1 00ml and125ml water respectively, and cover them with frosted glass sheets, numbered as1,2, 3, 4 and 5 in turn;

(2) oxygen is prepared by decomposing hydrogen peroxide (H2O2), and the water in the bottle 1 ~ 5 is discharged by the prepared oxygen;

③ Insert the wooden strips with Mars into 1 ~ 5 bottles in turn, and fill in the observed phenomena and calculated data in the table below.

Gas container number 1 2 3 4 5

The volume fraction of oxygen in the container is 28.9% 36.8% 44.7% 52.6% 60.5%.

The condition of the wooden strip with Mars is dim and very bright, and it is rekindled.

Try to answer the following questions:

(1) Hydrogen peroxide (H2O2) decomposes in the laboratory to produce oxygen, and the chemical equation of the reaction is ▲.

(2) According to the above experimental facts, the following statement is true ▲ (fill in the corresponding letters).

A. Only in pure oxygen can the wooden strips with Mars be rekindled.

B. When the volume fraction of oxygen in the container is greater than or equal to 52.6%, the wood strips with Mars can be re-ignited.

C. As long as there is oxygen, the wooden strips with Mars can be rekindled.

(3) The above experiments show that the combustion degree of a substance is related to the oxygen concentration, and the greater the oxygen concentration, the more intense the combustion. Please give another example and fill in the following table with the experimental contents and phenomena:

Experimental contents, experimental phenomena and experimental conclusions

▲▲▲▲▲ The greater the oxygen concentration, the more intense the combustion.

Fourth, the analysis and calculation problem (this problem has 5 small questions, 3 points for the 34th small question, 7 points for the 35th small question, 8 points for the 36th small question, 8 points for the 37th small question, 6 points for the 38th small question, and 32 points for * * *).

34. From May 65438 to May 2006, the State Food and Drug Administration of the United States reported the serious consequences of armillarisin A injection produced by Qiqihar No.2 Pharmaceutical Co., Ltd., which caused the deaths of many patients. The main reason was that the raw material inspection was out of control and diethylene glycol was used instead of propylene glycol. The chemical formula of diethylene glycol is C4H1OO3, which is very toxic. It can be oxidized into oxalic acid in human body, causing kidney damage. "Propylene glycol" can be used as a medicinal solvent, and can also be used for the synthesis of many drugs and new antioxidants. The chemical formula of "propylene glycol" is C3H8O2. Please answer the following questions based on the above information:

(1) The elements that make up "propylene glycol" and "diethylene glycol" are ▲.

(2) What is the mass ratio of carbon to oxygen in propylene glycol?

35. After learning the knowledge of measurement, speed, power and pressure, Xiaoming measured his weight as 50kg, the contact area between a shoe and the ground was 0.02 m2, the relative height of the hill near the school was 50m, and the distance from the foot of the hill to the top was100m. It took Xiaoming 200 seconds to climb from the foot of the hill to the top. According to the above data, answer the following questions: (g 10 N/kg)

(1) When Xiaoming changes from standing on two feet to standing on one foot, the pressure on the horizontal ground ▲ (you can choose "decrease", "unchanged" or "increase")

(2) What is the average speed of Xiao Ming's climbing?

(3) How much work did Xiao Ming do to climb from the foot of the mountain to the top of the mountain in order to overcome his own gravity?

After studying the chemical properties of metals, Xiao Wang wants to make a rough determination of the mass fractions of zinc and copper contained in zinc-copper alloys in the school laboratory. Under the guidance of the science teacher, the experimental device as shown in the figure is designed, and three reagents are selected: A. distilled water B. zinc, copper alloy C. dilute sulfuric acid. The basic idea of Xiao Wang's experimental design is to use the gas produced by the reaction between alloy and acid to discharge water into the measuring cylinder through the above experimental device, read out the volume of water in the measuring cylinder (regardless of other factors, the volume of gas produced by the reaction is the volume of water in the measuring cylinder), and calculate the mass fraction of zinc and copper in the zinc-copper alloy.

Try to answer the following questions:

(1) According to the experimental design idea, a certain amount of distilled water should be added to the jar during the experiment, and ▲ (fill in the letter number corresponding to the reagent) should be added to the test tube with a small hole at the bottom.

(2) In the experiment, Xiao Wang selected 3g of zinc, copper alloy and enough dilute sulfuric acid. After the reaction is completed, the volume of liquid received in the measuring cylinder is 0.1L. What is the mass fraction of zinc in zinc-copper alloy? (The density of hydrogen is 0.089g/L)

(3) If you want to determine the mass fraction of zinc in zinc particles partially oxidized to zinc oxide, can you use the above experimental method ▲ (fill in "can" or "can't"), please explain the reasons ▲.

37. Xiaogang has a hair dryer at home, and its working principle is shown in the figure. The nameplate has been blurred, only knowing that the rated voltage is 220V V V. In order to know the rated electric power of the hair dryer, Xiaogang turned off other electrical appliances and only let the hair dryer work at the rated voltage (drying objects). Figure A shows the reading of the electric energy meter before the hair dryer works, and Figure B shows the reading of the electric energy meter after the hair dryer works for 6 hours (all electric energy is converted into internal energy when the hair dryer works). Q:

(1) The electric energy consumed by the hair dryer for 6 hours is ▲ kWh.

(2) What is the rated electric power of the hair dryer?

(3) What is the heater resistance of the hair dryer?

38. Material 1: China-Singapore Zhejiang Network May 8 th News: On the morning of May 6, 2006, Cai, a migrant worker from Sichuan, died in the infectious disease area of Quzhou People's Hospital and was clinically diagnosed as rabies. Cai did odd jobs at a construction site in Huilong Village, Baiyun Street, Kecheng District, Quzhou, and was bitten by a dog 1 many months ago. In view of the incidence of rabies, the Office of Quzhou Municipal People's Government issued an urgent notice on the rapid development of rabies prevention and control work: conducting a general survey of dogs throughout the city, conducting a thorough investigation of dogs and cats in stock, and implementing compulsory immunization for dogs. Forced culling and harmless treatment were carried out on dogs with suspected symptoms without immunity.

Material 2: Rabies is an acute infectious disease caused by rabies virus, which affects people and animals, mostly dogs, wolves, cats and other animals. The methods to prevent rabies are as follows: 1. Treat the wound in time. The correct method is to wash the wound with 20% soapy water. If there is no soapy water, wash the wound with clean water on the spot. Never squeeze or suck the wound, and don't use soil dressing, ginger rubbing and other soil methods. Secondly, vaccinate as soon as possible, inject rabies vaccine and anti-rabies serum, and the sooner you vaccinate, the safer your life will be.

Read the above materials, analyze and answer the questions:

(1) Rabies is an infectious disease on the body surface, and the pathogen causing rabies is ▲.

(2) to carry out the dog (dog) survey in the city. From an ecological point of view, the dogs in the whole city are a ▲.

A. Community B. Population C. Ecosystem D. Ecogroup

(3) Injection of rabies vaccine and injection of anti-rabies serum are both specific immunization methods, but they are different. Please explain briefly. ▲

1. Multiple choice questions (5 points for each question, ***50 points) Only one of the four conclusions in each question below is correct. Please fill in the English letters indicating the correct answer in the brackets after each question. Any positive odd power of 1. number A is equal to the reciprocal of A, then () A.B.C.D has no such value. 2. As shown in the figure, there are six points on the number axis, and the integer closest to the number represented by point C is () A. B. 0 C. 1 D. 2 (adapted from the topic provided by Wang Yuanzheng of Shekou Middle School in Nanshan District, Shenzhen). 3. Zu Chongzhi, a great mathematician in ancient China, had quite accurately calculated pi as 3. 14 15926 before 1500. 5927, and take it as the density rate and reduction rate, then () A.B.C.D.4 Given that X and Y satisfy, then the value of the algebraic expression is () A.4B.3C.2D. 1.5. The sum of two positive integers is 60, and their least common multiple is 273. Then their product is () a.273b.819c.1911d.3549 6. Enclose an equilateral triangle with a line one meter long, and measure the area of this equilateral triangle as b square meters. Now let's take any point P in this equilateral triangle, and the sum of the distances from the point P to the three sides of the equilateral triangle is () m A.B.C.D.7 If we assume that be is the largest prime number not greater than A, then the result of the expression.