单项选择题

But given terrifying scenarios that are now all too possible, those costs will de a small price to pay for the extra ______ they will buy.

A．security
B．sector
C．section
D．sedation
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单项选择题
But, in the United States and in Europe, there is a growing danger that, as the attractiveness and impact of biology develops, an inadequate appreciation of physics will effectively lead to a ______ against it.
A．backwash
B．backlash
C．background
D．backing
单项选择题
An important objective of both exercises is to develop a structure for rigorously competitive ______.
A．self-review
B．peer review
C．talk show
D．peer counseling
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