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.
单项选择题
A．It remained almost unchanged.B．It was going up slowly.C．It was decreasing.D．It was increasing.
A．It remained almost unchanged.
B．It was going up slowly.
C．It was decreasing.
D．It was increasing.
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