单项选择题

A．To restore our atmosphere.
B．To stop refrigerator-use.
C．To prevent people from killing insects.
D．To restrict the use of some pollutants that harm the ozone layer.
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单项选择题
A．In a hotel.B．In a travel agency.C．At a restaurant.D．In an insurance company.
A．In a hotel.
B．In a travel agency.
C．At a restaurant.
D．In an insurance company.
单项选择题
A．In a theater.B．In a clinic.C．At a bank.D．In a plane.
A．In a theater.
B．In a clinic.
C．At a bank.
D．In a plane.
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