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（非英语专业学生做）( Par 3, Passage 3)These clouds will contain drops of water at temperatures above freezing, or ice crystals at temperatures below freezing.

A.
【参考答案】

气温在零摄氏度以上时这些云层将含有大量水滴；气温在零摄氏度以下时这些水滴就变成了(冰雪)结晶体。
气温在零摄氏度......

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