单项选择题

How much may a tusk in good condition sell for

A．Exactly ＄2,000.
B．Almost ＄2,000.
C．Less than ＄2,000.
D．＄2,000 or mor
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单项选择题
The longest time a human being can survive without sleep is probably ______ .
A．five days
B．seven days
C．ten days
D．twelve days
单项选择题
The writer implies that ______ .
A．sleep is important for good mental and physical health
B．a light sleep is as restful as a deep sleep
C．memory is improved during sleep
D．sleep is relatively unimportant for human beings
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