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．He misses his flight.B．He can find a good seat.C．He leaves the airport lust at the end of the trip.D．His luggage comes out last.
A．He misses his flight.
B．He can find a good seat.
C．He leaves the airport lust at the end of the trip.
D．His luggage comes out last.
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