单项选择题

A．The disadvantages of working in an office.
B．The waste produced in an office.
C．To save resources when working in an office.
D．How to save water in a restroom.
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单项选择题
A．The air quality is not as serious as the woman says.B．The air pollution is due to the industrial development.C．There were no factories here before.D．They should move to another city.
A．The air quality is not as serious as the woman says.
B．The air pollution is due to the industrial development.
C．There were no factories here before.
D．They should move to another city.
单项选择题
A．Call on people to protect sharks.B．Point out the living environment of sharks.C．Explain why the sharks are dangerous.D．An introduction to sharks.
A．Call on people to protect sharks.
B．Point out the living environment of sharks.
C．Explain why the sharks are dangerous.
D．An introduction to sharks.
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