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单项选择题
A．They pollute the atmospheric environment.B．They produce dangerous gases.C．They stop the sun’s heat reaching the earth.D．They cause global warming.
A．They pollute the atmospheric environment.
B．They produce dangerous gases.
C．They stop the sun’s heat reaching the earth.
D．They cause global warming.
单项选择题
A．At a hotel.B．At a theatre.C．At a cinema.D．At an airport.
A．At a hotel.
B．At a theatre.
C．At a cinema.
D．At an airport.
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