单项选择题

A．Write their lab report.
B．Find out Professor Smith’’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.
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单项选择题
The AIDS virus is spread through the exchange of infected blood or body fluids released during sexual activity.
A．Y
B．N
C．NG
单项选择题
We learn from the passage that navigation computers ____________.
A．will greatly promote sales of automobiles
B．may help solve potential traffic problems
C．are likely to be accepted by more drivers
D．will soon be viewed as a symbol of luxury
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