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问题 多项选择题 X型题

身体依赖性特征是（）

A．有加大剂量的趋势

B．对药物不仅产生精神依赖，而且停药后有戒断症状

C．对人和社会都产生危害

D．无加大剂量趋势

E．停药后不产生戒断症状

答案

参考答案：B, C

选择题

He says all _______ tried their best and that all that can be done _______ been done.

A．has, has

B．have, have

C．have, has

D．has, have
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选择题

Were there            sharks in the aquarium?    [ ]

A. some        

B. any    

C. a lot  

D. much
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