The chart below shows the daily changes of air temperature, surface long-wave radiation energy and solar energy incident on the ground in a certain place in China. Around sunset, Zhengzhou

Question 2:B

Question 1: This question examines the heating process of the atmosphere. When the height of the sun is the highest at noon, it is noon; Ground radiation is the direct heat source of the ground, so the daily variation of temperature is directly related to the long-wave radiation energy of the ground. So choose option a in this question.

Question 2: By sunrise at 6 o'clock and sunset at 18: 00, the daylight saving time of that day is 12 hours, and the sun shines directly on the equator. The shortening of daytime in Zhengzhou indicates that the direct point of the sun is moving south. It is the autumnal equinox. Autumn is crisp in North China. So this question chooses option B.