Xi' an winter air pressure

Question 1:C

Question 2: D.

Test analysis:

Problem 1: Xi' an is located in the center of high pressure, and the airflow sinks, mainly sunny; There ar

Question 1:C

Question 2: D.

Test analysis:

Problem 1: Xi' an is located in the center of high pressure, and the airflow sinks, mainly sunny; There are few clouds on sunny days, and the radiation of the atmosphere to the sun is less weakened during the day, and the temperature is high. At night, the atmospheric inverse radiation is weak, the temperature is low, and the temperature difference between day and night is large. But this season is winter, the weather is fine, the atmospheric insulation effect is poor, and there may be frost at night. So choose C.

Question 2: The weather system A in the picture is a cold front, which may cause precipitation and cooling weather in Urumqi, but there will be no continuous precipitation; In the next three days, the isobar will change from sparse to dense, so the wind speed will change greatly and increase; From the distribution analysis of isobar in the figure, the wind direction will change from southerly wind to northerly wind. So choose D.