单项选择题

A．The twenty-first.
B．The twenty-second.
C．The twenty-third.
D．The twenty-fourth.
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单项选择题
A．About 80 miles per second.B．About 70 miles per second.C．About 18 miles per second.D．About 17 miles per second.
A．About 80 miles per second.
B．About 70 miles per second.
C．About 18 miles per second.
D．About 17 miles per second.
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