单项选择题

To a large degree, man is still at the______ of weather.

A．risk
B．mercy
C．track
D．calamity
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单项选择题
We ought to______ detailed investigations and studies before we draw any conclusions.
A．administrate
B．process
C．undertake
D．duplicate
单项选择题
Thirty years of field work enabled the female scientist to gain a better______ into the nature as it is.
A．insight
B．discovery
C．concept
D．conviction
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