单项选择题

After expiration date, contact lens solution______.

A．will remain stable
B．will become poisonous
C．will not be effective
D．will cause eye irritation
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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
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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