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.
<上一题 目录 下一题>
热门 试题

填空题
Theorists aim at making non-theorists do some research about______within the framework set by them.
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.
相关试题