The weather forecast for Zhongshan is one week.

Analysis of test questions: The weather is clear and there are few clouds in the third day, so the atmosphere has a weak weakening effect on solar radiation; The water vapor content in the atmosphere decreases, so the ability to absorb ground radiation is weak; Due to the sunny weather, the atmosphere has little effect on weakening solar radiation during the day, and the temperature is high. At night, the atmospheric inverse radiation is weak, the temperature is low, and the daily variation is large. Sunny, less clouds, weak atmospheric inverse radiation. So choose B.