单项选择题

An example of "soft" energy mentioned in this passage is ______.

A．solar energy
B．wind
C．natural gas
D．gasoline
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单项选择题
According to the passage, highway building______.
A．has quickened
B．has been discouraged
C．should be encouraged
D．has been taxed at a lower rate
单项选择题
What has NOT been controlled at all as regards water pollution
A．Industrial polluters.
B．Sewage.
C．Rain runoff.
D．Toxic substances.
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