单项选择题

It is very plain that such a life as this is far more ______ to health than that of the man who can afford little leisure for necessary rest in the course of the day.

A．conductive
B．constructive
C．conciliate
D．conducive
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单项选择题
Mr Chen complained about the ______ air-conditioner he bought from the company.
A．inefficient
B．defective
C．ineffective
D．deficient
单项选择题
Diamonds are usually cut to bring out their natural luster and to remove any flaws.
A．germs
B．shortcomings
C．flakes
D．defects
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