单项选择题

In order to photograph ______ animals, elaborate flashlight equipment is necessary.

A．predatory
B．wild
C．nocturnal
D．rare
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单项选择题
The reasoning in this editorial is so that we cannot see how anyone can be deceived by it.
A．coherent
B．special
C．cogent
D．specious
单项选择题
He worked ______ at his task for weeks before he felt satisfied that the results would justify his long effort.
A．occasionally
B．regularly
C．patiently
D．assiduously
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