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

A．lives
B．stays
C．sleeps
D．plays

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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