单项选择题

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
A．The heavy snowfall.B．The melting snow and heavy rain.C．The tropical storm.D．The dike has been destroyed.
A．The heavy snowfall.
B．The melting snow and heavy rain.
C．The tropical storm.
D．The dike has been destroyed.
单项选择题
A．was nominated for Defense SecretaryB．was member of the Senate Arms Services CommitteeC．was concerned by the growing tension on the Korean PeninsulaD．is Deputy-Secretary of Defense
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
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