单项选择题

Monique had to exercise great care at this______ stage of the experiment.

A．scientific
B．potential
C．valid
D．crucial
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单项选择题
The UFO phenomenon is not new to us, but scientists are still not able to offer any______ explanations.
A．specific
B．rational
C．virtual
D．literal
单项选择题
He obviously displays a great______ for some of your poems.
A．consent
B．admiration
C．respect
D．pleasure
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