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
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单项选择题
Such an ______ act of hostility can only lead to war.
A．overt
B．opportunistic
C．occadional
D．unequaled
单项选择题
The pilot made an unexpected ______ because of engine trouble.
A．conclusion
B．crash
C．victory
D．landing
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