单项选择题

The government is doing a ______ of people's changing social habits.

A．plan
B．survey
C．project
D．research
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单项选择题
By cutting down trees we ______ the natural habitat of birds and animals.
A．damage
B．injure
C．hurt
D．harm
单项选择题
The title of the book was on the ______ of my tongue, but I just could not think of it.
A．end
B．tip
C．back
D．point
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