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
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
单项选择题
Edison's remark that genius is one percent inspiration and ninety-nine percent perspiration demonstrates that the ______ worker is valuable.
A．inspired
B．assiduous
C．perspired
D．eager
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