单项选择题

A．Sex contact.
B．Blood exchange.
C．Drug abuse.
D．Casual contact.
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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.
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.
填空题
In the author’s opinion, who contribute(s) to the progress of human society
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