单项选择题

It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to ensure that alternative materials are substituted whenever possible.

A．utilized
B．mobilized
C．acquired
D．cultivated
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单项选择题
I have offered a prediction that the reforms run a very high risk of being______ by a general collapse of confidence in the ruble.
A．set back
B．let down
C．hold back
D．run down
单项选择题
Most of the members made such a______ protest against the proposal that the committee had to yield.
A．soft
B．mild
C．vigorous
D．voluntary
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