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【单选题】
在以下三种分子式中C＝C 的红外吸收哪一种最强?(a) CH3- CH = CH 2(b) CH3- CH = CH - CH 3（顺式）(c) CH3- CH = CH - CH 3（反式）A.
a
B.
b
C.
c
D.
三者强度相同
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A.
Plus and minus dimensions
B.
Limit dimensions
C.
Radial dimensions
D.
Basic dimensions
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【单选题】To the writer, the fact that women alter their old-fashion dress is seen as ______.
A.
a waste of money
B.
a waste of time
C.
an expression of taste
D.
an expression of creativity
【单选题】What can we learn about old women in terms of fashion？
A.
They are often ignored by fashion designers .
B.
They are now more easily influenced by stars .
C.
They are regarded as pioneers in the latest fashion .
D.
They are more interested in clothes because of their old age .
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