单项选择题

Good advice for collectors is " ______". A) Never save the first specimen you find B ) Always save the first specimen you find C) Save the second specimen you find D) Save all but the first specimen you find
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单项选择题
This passage suggests that not getting enough sleep might make you ______.
A．dream more often
B．have poor health
C．nervous
D．breathe quickly
单项选择题
The average number of hours of sleep that an adult needs is ______.
A．approximately six hours
B．around ten hours
C．about eight hours
D．not stated here
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