单项选择题

A．How to use a camera.
B．How to use a washer.
C．How to use a keyboard.
D．How to use a tape recorder.
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单项选择题
The difference between Microbicides with traditional ABC practice is________.
A．it is colorless and odorless
B．it can be used to prevent sexual transmission of HIV
C．it put the power to prevent AIDS into the hands of women
D．it is used mainly in Africa
单项选择题
With what topic is the second paragraph mainly concerned
A．How the Sun evolved.
B．The structure of the Sun.
C．Why scientists study the Sun.
D．The distance of the Sun from the planets.
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