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.
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单项选择题
A．Anyone can do it well.B．No one can do it well.C．Mary probably can’t do it.D．Only Mary can do it well.
A．Anyone can do it well.
B．No one can do it well.
C．Mary probably can’t do it.
D．Only Mary can do it well.
填空题
typical
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