单项选择题

There are over seventy（）in our hospital.

A．woman doctors
B．woman doctor
C．women doctors
D．women doctor

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单项选择题
When you are at your（）end，you should not lose your head.

A．wit's
B．wit
C．wits'
D．wits's
填空题
Encyclopedias can be used to acquire knowledge in any field，to obtain informations on a particular subject，or to deal with other academic questions.
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