起重机的拆装作业应在白天进行，当遇有（）天气时应停止作业。
A、大风
B、潮湿
C、浓雾
D、雨雪
E、高温
参考答案：A, C, D
Betty doesn't often _____ her work at home.[ ]
A. do
B. does
C. to do
D. doing
作者论
