单项选择题

Which of the following is NOT true of Canadarm 2

A．It has seven joints.
B．It is going to be installed in the proposed mission.
C．One of its brakes does not function properly.
D．A new computer program is being tried out on it.

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单项选择题

The truss is______.

A．a space shuttle that carries a support beam
B．a mobile transport platform
C．a framework designed to support devices
D．a laboratory

单项选择题

One of the strengths of the writer's teacher was that he taught his pupils to ______.

A．view the world with precision
B．express their feelings in poetry
C．describe objects in detail
D．create imaginary worlds