单项选择题
Recycling wastes slows down the rate ________ which we use up the Earth’s finite resources.
A．in
B．of
C．with
D．at
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单项选择题
____ me most was that the young boy who had lost both arms in an accident could handle a pen with his feet.
A．That amazed
B．It amazed
C．Which amazed
D．What amazed
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单项选择题
The old building is in a good state of ________ except for the wooden floors.
A．observation
B．preservation
C．conservation
D．compensation
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