单项选择题

It is obvious that the assumption behind horror stories is that______.

A．human beings are basically good
B．mankind is evil in nature
C．mankind can be taught to be good
D．both A and C
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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
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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