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
In 1844, Charles Stun. a British soldier and colonial administrator, made an expedition （）a supposed inland sea; his party penetrated more than 1000 miles northward, almost to the center of Australi

A．A. in quest of
B. with regard to
C. in favor of
D. by way of
单项选择题
Why do teens drink Reasons vary from ______ pressure to family patterns to social conditioning.
A．spouse
B．peer
C．antagonist
D．competitor
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