单项选择题

There ought to be less anxiety over the perceived risk of mountain climbing than_______in the public mind today.

A．exists
B．exist
C．existing
D．to exist
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单项选择题
Cancer is second only______ heart disease as a cause of death.
A．of
B．to
C．with
D．from
单项选择题
Tom’’s mother tried hard to persuade him to______. from his intention to invest his savings in stock market.
A．pull out
B．give up
C．draw in
D．back down
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