Although the weather is fine.

The following is a excerpt from Ding Qiang's diary. She is a senior three student in a middle school. "On Sunday, the sky finally cleared up and the wind weakened. Although it didn't rain all the time, it was surprisingly cold, so we had to add another sweater. Dad went to repair the plastic shed damaged by the wind early in the morning. My mother and I went to help with the broom. There is a thick layer of dust on the greenhouse. Two "they are also busy in the field, they lit piles of firewood at the edge of the wheat field, and the smoke rolled ..."

Test analysis:

1, the data in the title describes that after the weather system transits, the weather turns fine and the temperature drops, which is a cold front crossing; There should be sandstorms due to strong winds and dust storms; Farmland needs to be reinforced, and burning firewood to make smoke is to prevent cold, which means that the temperature drops a lot, and crops need to be kept warm, which may be a cold wave crossing the border. Typhoon transit does not need to keep warm and do not need to be a greenhouse. C is correct.

2. Before the weather system transited, the air here was dry, with only strong winds and cooling, and no precipitation. Choose b correctly.