单项选择题

This index is most probably taken out of a book on

A．history of the English language
B．Greek mythology
C．social development
D．rhetoric
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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
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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