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, 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.
单项选择题
In 1991, New York was the world's ______urban are
A． largestB. second largestC. third largestD. fourth largest
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