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
单项选择题
The vast ______ area of this country enabled us to welcome the hordes of immigrants that flocked to our shores.
A．teeming
B．explored
C．flourishing
D．undeveloped
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