单项选择题

While researchers may not ______ the expansive claims of hard-core vitamin enthusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.

A．authorize
B．license
C．counteract
D．endorse
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单项选择题
Every year a number of students graduate from the school which will ______ new students the first week in September.
A．enroll
B．recruit
C．collect
D．reproduce
单项选择题
Could a mechanical device ever ______ human intelligence--the ultimate test being whether it could cause a real human to fall in love with it
A．destroy
B．duplicate
C．forge
D．eliminate
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