单项选择题

Compared to alternative energy, one of the disadvantages of fossil fuels is ______.

A．Mining is difficult.
B．It costs a lot of money to preserve.
C．They are difficult to be processed.
D．They are non-renewable.
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单项选择题
Mr. William Perrey ______.
A．was nominated for Defense Secretary
B．was member of the Senate Arms Services Committee
C．was concerned by the growing tension on the Korean Peninsula
D．is Deputy-Secretary of Defense
单项选择题
What caused the Minnesota River to run out of its bank
A．The heavy snowfall.
B．The melting snow and heavy rain.
C．The tropical storm.
D．The dike has been destroyed.
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