单项选择题

In para. 6 the author______.

A．gives an example of ideal rivers for generating electricity
B．explains in detail what a suitable fiver for generating electricity should be
C．states that the amount of water in the fiver is very important
D．implies that the water plays an important role in industry
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单项选择题
According to paragraphs 6 and 7,which is most fundamental in producing hydroelectric power ______.
A．Adequate flow of water
B．A steep fall
C．The location of the fiver
D．The amount of the water
单项选择题
Since USAID began its first HIV AIDS prevention efforts eight years ago, the epidemic has changed dramatically this statement______.
A．proves that the epidemic has been spreading very fast over the past eight years
B．implies that the USAID was not very successful in the past eight years
C．shows that the epidemic has spread too fast to be controlled over the past eight years
D．explains that the epidemic has been controlled
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