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
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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
单项选择题
From para.4 we may draw the conclusion that______.
A．people living with HIV/AIDS are good advocates and communicators and they are very successful
B．the voice of people living with HIV/AIDS is too weak to be heard
C．the effective way to deal with HIV/AIDS is the full involvement of people living with HIV/AIDS and all of the communities
D．people living with HIV/AIDS had only one way to go, that is death
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