单项选择题


Where does Edgar Davis call from

A． British.
B． Brazil.
C． Boston.
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单项选择题
What does the woman expect to learn from her study
A. The kinds of molecules in which carbon may be replaced by silicon.
B. The importance of silicon.
C. The difference between molecules and silicon.
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How did the automobile affect the work force in the 1950’s and 1960’s
A. It allowed workers to spend more time at home.
B. It gave workers opportunity for better training.
C. It let workers live far from their jobs.
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