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【单选题】
若正多边形有 n 条边 , 它们对应的向量依次为 a 1 , a 2 , ... , a n , 则这 n 个向量 ( )A.
都相等
B.
C.
都不共线
D.
模都相等
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举一反三
【单选题】It was in the lab _____ was taken charge by Professor Wang ______ they did the experiment.
A.
where, that
B.
that, which
C.
that, where
D.
which, that
【单选题】To our surprise,Professor Wang was______appointed president of the university.
A.
formerly
B.
firmly
C.
formally
D.
fairly
【单选题】Professor Wang _______to give us a talk next week. ――Really ? That is good news .
A.
will invite
B.
is going to invite
C.
will be invited
D.
has invited
【单选题】Professor Wang has no time to go with us because his work is ________.
A.
speeding up
B.
piling up
C.
coming over
D.
going mess
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