题目内容

How do drugs help people stop smoking work？

A. They act on smokers' brain.
B. They fight against nicotine directly.
C. They have the same effect on dopamine as nicotine does.
D. They counteract the effect on dopamine made by nicotine.

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A．OrB．HoweverC．NeverD．Meanwhile

A. Or
B. However
C. Never
D. Meanwhile

A．asB．thanC．as much asD．that

A. as
B. than
C. as much as
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The new car at the motor-show was a very unusual shape.

A. rare
B. common
C. strange
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下面集合之间的包含和属于关系中为真的是 Ⅰ．
Ⅱ．{Ф}∈{Ф，{Ф，{Ф}}}
Ⅲ．{a,b}∈{a，b，{a，b}}
Ⅳ．{a,b}∈{a，b，{a，b，c}}

A. Ⅰ和Ⅱ
B. Ⅰ和Ⅲ
C. Ⅰ和Ⅳ
D. Ⅱ、Ⅲ和Ⅳ