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

One woman collected over 400 ______.

A．dolls
B．stamps
C．combs
D．toy soldiers

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