单项选择题

We were unable to reach a decision because we felt that the speaker had been ______ and had avoided answering many of our questions.

A．noncommital
B．practical
C．contentious
D．unprepared
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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
The ditry tricks played upon the Secretary of the State are ______ by the high-ranking officials behind the scenes.
A．reckoned
B．meddled
C．manipulated
D．signified
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