单项选择题

Concrete is used in extensive projects because of ______.

A．the increase in traffic
B．the cost of other materials
C．the change of the climate
D．the construction of the roads
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单项选择题
The author dreams of making friends with this female not because ______.
A．she has a sweet face, a natural way and behaves gracefully
B．the author himself is kind of shy and doesn’ t make friends easily
C．She offers to talk with the author and smiles at him pleasantly
D．the author is deeply attracted by her graceful manners and sweet appearance
单项选择题
According to Hahn, all the following increase the transmission of AIDS virus EXCEPT ______.
A．hunting and killing more chimpanzees
B．more champ hunters moving to cities
C．people’s changed sexual behaviors
D．travelling to more African countries
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