单项选择题

In spring and summer, the most popular ______is tennis.

A．work
B．activity
C．games
D．sport
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单项选择题
It is a ______ride from his home to the shopping center.
A．ninety-miles
B．ninety-mile's
C．ninety miles
D．ninety-mile
单项选择题
We are using up our natural resources too quickly and at the same time we are ______our environment with dangerous chemicals.
A．protecting
B．saving
C．polluting
D．fighting
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