A．a；the B．the；a C．/；the D．/；/

　　答案　D

　　解析　考查冠词的用法。此处out of habit为固定短语，意为：出于习惯；for pleasure意为：出于娱乐。句意：我吸烟出于习惯，而不是娱乐。我有这个习惯已经20年了。

　　2．-Mary has a very low opinion of George.

　　-It can't be any worse than ________ of her.

　　A．his B．he C．him D．he does

　　答案　A

　　解析　考查代词的用法。此处相当于：it can't be any worse than his(opinion)of her. 意为：没有比他(乔治)对她的看法更差的了。

　　3．________ help the people in the snowstorm in the south made him worried.

　　A．Not known how to

　　B．Unknown what to do to

　　C．His knowing not how to

　　D．His not knowing how to

　　答案　D

　　解析　考查动名词的复合结构作主语。此处His not knowing how to help the people in the snowstorm in the south是动名词的复合结构作主语。

4．The woman pulled her hat low down ________ her eyes in order