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
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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
单项选择题
______ the tense hostile atmosphere, nobody said a word, for it would have triggered a fierce fight.
A．In the course of
B．In spite of
C．In case of
D．In the midst of
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