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
According to the passage, which is the real reason for people to move from rural to urban areas
A．Adequate job opportunities.
B．Better public facilities.
C．Very poor economic conditions in rural settlements.
D．An increase in rural population.
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