单项选择题

He became aware that he had lost his audience since he had not been able to talk ______ around one topic.

A．coherently
B．initiatively
C．flexibly
D．pointedly
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单项选择题
The professor gave ______ instruction to the whole class so as to make every student understand how to conduct the experiment in the lab.
A．explicit
B．afflictive
C．authoritative
D．oblivious
单项选择题
No one could come up with an easy solution to the government's predicament-labor ______ which is caused by the wars.
A．decline
B．vacancy
C．rarity
D．shortage
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