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【单选题】
下列说法不正确的是( )A.
具有手性碳的分子不一定有手性
B.
只要分子具有对称面或对称中心，则分子一定没有手性
C.
外消旋体与内消旋体都不具有旋光性，且都属于纯净物
D.
一对对映异构体比旋光度大小相等，方向相反
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举一反三
【单选题】The American movies are popular because _________
A.
they are well—made and the stories are interesting
B.
the characters in the movies are free to do whatever they like
C.
the heroes have to cope with many problems and frustrations
D.
good guys in the movies always win in the end
【简答题】汽车天窗按动力形式可分为（）和（）。
【单选题】It’s a long stor, but there are new words in it. ______ it will be easy for children.
A.
or
B.
So
C.
But
【简答题】汽车天窗按动力形式可分为手动式和
【简答题】The best place for ___ ___ of money is a bank. ( stor e )
【单选题】Shelley's masterpiece,. Prometheus Unbound, is a verse drama, which borrows the basic story from ______.
A.
the Bible.
B.
a German legend.
C.
a Greek play.
D.
One Thousand and One Nights.
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