单项选择题

Why is it that small children are so energetic

A．effective
B．vigorous
C．active
D．busy
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单项选择题
Thinking of the interesting stories helped the time to pass, and the work seemed less tough.
A．rough
B．durable
C．vigorous
D．arduous
单项选择题
The audience at the music hall applauded enthusiastically after the piano solo.
A．laughed
B．clapped
C．jumped
D．chatted
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