单项选择题

He spends about 10 days each month back in Hong Kong, ______ projects in the works at his production company.

A．manipulating
B．supervising
C．maneuvering
D．sieging
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单项选择题
It is sometimes difficult to discuss medical issues in a way that is not ______ to ordinary people.
A．conspicuous
B．ambiguous
C．intelligible
D．ingenious
单项选择题
Another way to judge whether your home has or could develop indoor air problems is to potential sources of indoor air pollution.
A．signify
B．identify
C．claim
D．recognize
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