单项选择题

To determine vitamin A content in an apple,_____.

A．it has to be ground first
B．it has-to be weighed first
C．it has to be X-rayed first
D．it has to be first treated in a chemical liquid
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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.
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
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