Clouds form（）.
A. as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small droplets
B. as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming clouds
C. dry air compresses moisture from the atmosphere into clouds
D. when the relative humidity of the atmosphere is low
旅客列车、回送客车底不准编挂货车。
A. 正确
B. 错误
未达账项仅仅是指企业未收到凭证而未人账的款项。()
A. 正确
B. 错误
保安员执勤时不准喝酒、看书报、（）或做与工作无关的事情。
A. 骑单车
B. 打手电
C. 打瞌睡
D. 聊天
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