Read the "Map of Ground Weather Situation in Some Areas of China at a Certain Time" (as shown in the figure) and answer the following questions. (4) At this time, Area A is controlled by _ _ _ _ _ wea

Read the "Map of Ground Weather Situation in Some Areas of China at a Certain Time" (as shown in the figure) and answer the following questions. (4) At this time, Area A is controlled by _ _ _ _ _ weather system. According to the distribution and value of isobar in the figure, it is not difficult to judge that A is controlled by high pressure, and sunny days often appear under its control.

(2) The front exists in the trough with low air pressure, so only the dotted lines I and C will form the front. According to the horizontal moving direction of cyclone airflow in the northern hemisphere, it can be judged that the airflow at C is from high latitude to low latitude (the nature of active airflow is cold).

For the cold front; The airflow from low latitude to high latitude (active airflow is warm) is a warm front. After the warm front crossed the border, the temperature rose, the air pressure decreased and the weather turned fine.

(3) According to the graphic analysis, ② Isobar is the densest, and the horizontal pressure gradient force is large, so the wind force is also large.

(4)A, Northeast China is controlled by low pressure (cyclone) at this time, and rainy weather often occurs under its influence, which does not meet the meaning of the question;

First, combined with the isobar, according to the wind direction, we can draw and analyze the oblique isobar. From high pressure to low pressure, the geostrophic force in the northern hemisphere is to the right. The northeast wind blows in Tarim basin, which does not meet the meaning of the question;

C, the eastern Inner Mongolia Plateau is controlled by low pressure (cyclone) at this time, and rainy weather often occurs, so it is correct;

D, combined with isobar, according to the wind direction, we can draw and analyze it by oblique isobar method. From high pressure to low pressure, the geostrophic force in the northern hemisphere is to the right. The southwest wind blows in the North China Plain, which does not conform to the meaning of the question.

So choose: C.

(5) In spring, the dry and cold air from the mainland still controls the northern region, and the cold air mass is active frequently. According to the graphic analysis, there is a cold front in northwest and north China at this time. Under the influence of the cold front, cold waves, sandstorms and other disastrous weather often appear in northwest and north China in spring.

So the answer is:

Anticyclone and n-7p; & ampn-7p； very good

(2)C & amp； n-7p； & ampn-7p； & ampn-7p； & ampn-7p； The sun is shining and the temperature is rising.

(3)② Isobars are dense.

(4)C

(5) Sandstorm