单项选择题

What was the most important job for the astronauts of Discovery

A．Spacewalking.
B．Replacing the broken flywheel.
C．Entering the International Space Station.
D．Contacting the ground controllers.
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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
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.
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