单项选择题
21()
A.people
B.residents
C.population
D.number
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填空题
A. window B. wild C. wrinkle D. why
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单项选择题
The main topic of the passage is ______.
A. conditions in the work place
B. the freedom of industries in the past
C. changes in industrial production
D. the safety and health of workers and customers
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