单项选择题

Passage Three

A. Mass production.
B. Medical care.
C. Safety measures.
D. Labor practices.
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单项选择题
A. In the library. B. In a used bookstore.C. In the street. D. In a historical museum.
A. In the library.
B. In a used bookstore.
C. In the street.
D. In a historical museum.
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