单项选择题
The questions ______ in English.
A．answer
B．must answer
C．must be answered
D．can answer
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单项选择题
21（）
A．lives
B．stays
C．sleeps
D．plays
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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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