单项选择题

The body apparently resents being dosed with unusual amounts of a vitamin or mineral and its first______ is to excrete them.

A．reaction
B．impulse
C．response
D．instinct
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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
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
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