单项选择题

There are, for example, widely differing views of the potential value of the assets______.

A．at stake
B．at a stroke
C．at an action
D．at a time

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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

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

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