单项选择题

Even researchers, for example, ______ applying the concept of "cohesion" may not produce the most cost-effective science.

A．appreciate for
B．appreciate that
C．appreciate as to
D．appreciate as
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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
单项选择题
This, they say, is proof that the more primitive species was not simply supplanted by an advanced one ______ into one.
A．but also developed
B．but reformed sharply
C．but merely turned
D．but evolved slowly
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