单项选择题

It is thus of exceptional importance ______ extinction theories, but until now problems with dating have limited its potential.

A．for a testing purpose on
B．as a testing reason in
C．as a testing ground for
D．for some useful ends of
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单项选择题
Despite the end of the Cold War, defense and civil industrial interests in small science are______.
A．as stronger as before
B．as powerful as is expected
C．as strong as ever
D．as more powerful as expected
单项选择题
The accommodation was at a comfortable hotel, the meeting facilities ______.
A．are excellent
B．excellent
C．are available
D．be excellent
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