题目

- - I' m going to school now, Mum, Bye.          -- Just a minute. It's cold outside, _________ your coat, please.            A. Put on         B. Take off        C. Put up         D. Take down 答案：A在空气潮湿的地方，每当要下雨之前，自来水管、水缸的外侧会形成水珠，这是（ ）A．汽化现象B．液化现象C．升华现象D．蒸发现象