单项选择题

A．They’re cheaper and simpler to drive.
B．They are faster.
C．They cause littler air pollution.
D．They have a brighter future.
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单项选择题
A．It can’t be compressed.B．It’s often polluted.C．Its temperature often fluctuates.D．It limits their size.
A．It can’t be compressed.
B．It’s often polluted.
C．Its temperature often fluctuates.
D．It limits their size.
填空题
The main idea of the first paragraph is that importance should be attached to the systematic study of ______.
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