单项选择题

Scientists call on us to () nature and become better recyclers.

A．learn of
B．learn to
C．learn about
D．learn from

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单项选择题
The railway station is within () drive from here.

A．three hours
B．three-hours
C．three-hour
D．three hour-long
单项选择题
A library with five thousand books () to the nation as a gift.

A．is offered
B．has offered
C．are offered
D．have offered
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