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
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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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单项选择题
A freely tailing body has an acceleration of 32 feet a second during each second ______ it falls.
A．that
B．why
C．which
D．as
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