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.
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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.
单项选择题
A．3 and 7.B．7 and 9.C．3 and 9.D．3 and 13.
A．3 and 7.
B．7 and 9.
C．3 and 9.
D．3 and 13.
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