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
Up until the 1960s the instruments used to perform surgical operations were ______.
A．fashionable
B．extraordinary
C．special
D．basic
单项选择题
In areas where avalanches are known to happen ______.
A．local residents stay indoors when the weather is bad
B．measures are taken to prevent serious avalanches
C．small avalanches can easily be prevented
D．skiers form themselves into a wall to keep the snow in position
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