单项选择题

Those who let uncertainty ______ rarely achieve much.

A．turn them down
B．send them down
C．weigh them down
D．huddle down
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单项选择题
______popularity of subject matter and frequency of use, the books on the two middle shelves will be the most helpful to you.
A．As of
B．As regards
C．As from
D．As against
单项选择题
The speaker went on and on, ______ to his listeners' obvious boredom.
A．obligated
B．obsessive
C．obvious
D．oblivious
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