单项选择题

By cutting down trees we ______ the natural home of birds and animals.

A．harm
B．hurt
C．injure
D．damage
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单项选择题
Without a (an) ______ passport a tourist is forbidden to enter a country.
A．operative
B．effective
C．valid
D．efficient
单项选择题
The wealth of a nation should be measured ______ the health and happiness of its people as well as the material goods it can produce.
A．in regard with
B．in line with
C．by means of
D．in terms of
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