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【单选题】
按 S N 2 历程,化合物 a.CH 3 CH 2 CH 2 Br 、 b. (CH 3 ) 2 CHBr 、 c.(CH 3 ) 3 CBr 的反应活性是 :A.
a ＞ b ＞ c
B.
b ＞ c ＞ a
C.
c ＞ a ＞ b
D.
c ＞ b ＞ a
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【单选题】She felt frustrated when nobody understood what she was trying to say.
A.
boring
B.
upset
C.
angry
D.
dull
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A.
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B.
Women like to show off their beauty.
C.
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D.
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A.
make to work hard
B.
replaced
C.
caused to suffer
D.
relieved
【单选题】She felt completely _____ during the vacation but now she has to go back to work again. [ ]
A.
in anger
B.
at once
C.
in general
D.
at ease
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