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
Once the baby has mastered the idea that space is three-dimensional, it out and begins grasping various kinds of objects.
A．shouts
B．reaches
C．aims
D．pull
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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