单项选择题
The age of the general practitioner is over. More and more graduates of medical schools tend to ______,that is, to concentrate on limited areas of their profession.
A．generalize
B．rationalize
C．study
D．specialize
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单项选择题
It's time-consuming to locate the book in the bookcase, because the way he arranges books is quite ______.
A．mighty
B．wholesome
C．undesirable
D．random
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单项选择题
When the colonel learned that headquarters had been unable to send him reinforcements, he ______ the order for the scheduled attack.
A．countermanded
B．relinquished
C．rephrased
D．invalidated
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