单项选择题

What is the speed of the outpost

A．15 miles per second.
B．5 miles per second.
C．206 miles per second.
D．5 miles per minut
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单项选择题
Which of the following is true of the American-made devices
A．They are washing machines.
B．They are used to steer and steady the International Space Station.
C．They have been plagued with problems for more than three years.
D．They will be replaced by the Russian-made devices.
单项选择题
Which statement is NOT true about the smoke haze
A．It forced schools to close.
B．It forced the biggest seaport of Malaysia to shut down.
C．It drifted from forest fires.
D．It occurred in 1997.
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