“吕端大事不糊涂”典出（）。A、宋太祖 B、宋高祖 C、宋太宗 D、宋江

长期口服短效避孕药者应该在停药（）后再怀孕，才比较安全。

A.1个月 

B.3个月 

C.6个月 

D.9个月

I don't know____ makes her afraid of having her business discussed. [ ]

A. what it is about Mary that

B. that is it about Mary that

C. what is it about Mary that

D. that it is about Mary that

下列一组动作适合锻炼的部位是（）前后屈伸、侧向偏头、左右平旋、向前过伸、回头望月、摇头晃脑、捏揉颈部。

A.腰部

B.膝关节

C.颈部

D.肩部

使用手拉葫芦时，一般起重量5-8T可用（）打链。

A.1人

B.2人

C.3人