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
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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