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．exiting
D．to exist
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单项选择题
Statistics is a discipline ______all the other sciences.
A．affected
B．affecting
C．to be affected
D．being affected
单项选择题
Because Edgar was convinced of the accuracy of this fact, he ______his opinion.
A．struck at
B．strove for
C．stuck to
D．stood for
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