单项选择题

Many countries are increasing their use of natural gas，wind and other forms of（）.

A．energy
B．source
C．power
D．material

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单项选择题
Some people would rather ride bicycles as bicycle riding has ______ of the trouble of taking buses.
A．nothing
B．none
C．some
D．neither
单项选择题
______ the poem a second time, the meaning will become clearer to you.
A．Your having read
B．While reading
C．If reading
D．When you read
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