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【简答题】
研磨导套常出现的缺陷是 A. “喇叭口”（的尺寸两端大中间小）
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【单选题】The two brothers are twins, but their character is not to each other. One is kind, and the other is rude. [ ]
A.
similar
B.
familiar
C.
near
D.
the same
【单选题】______ that kind of weather persist，it would be very likely that the two ships would touch each other．
A.
If
B.
Provided that
C.
Should
D.
When
【单选题】What kind of training is optional for a licensed doctor?
A.
Two years of a premedical course.
B.
Four years of medical course.
C.
Two years of residency in a hospital.
D.
One year or more of a specialty course.
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