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
I can think of nothing more ______ than arriving at the theater and discovering that I have left the tickets at home.
A．vicious
B．inviting
C．vexatious
D．immoral
单项选择题
After graduation, he was ______ to a teaching post. But a year later, he resigned from the job and plunged himself into business.
A．dominated
B．dispersed
C．designated
D．displaced
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