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
In his researches on ______ diseases, he discovered many facts about the lungs of animals and human beings.
A．inherited
B．chronic
C．infectious
D．pulmonary
单项选择题
Such an ______ act of hostility can only lead to war.
A．overt
B．opportunistic
C．occadional
D．unequaled
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