比起头肩形态来说，三重顶(底)更容易演变成持续形态，而不是反转形态。 ()
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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.
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
D. that
The new car at the motor-show was a very unusual shape.
A. rare
B. common
C. strange
D. curious
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