单项选择题

Dr. Noack makes a comparison between the worst and the best cases in order to ______.

A．imply the situation can be improved into the best case
B．warn the African against the worst case
C．prove how poverty-stricken it can be in Africa
D．show the emergent poverty situation in Africa
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单项选择题
The attitude of the author toward Africa's future is
A．indifferent
B．subjective
C．worried
D．negative
单项选择题
The main theme of this passage is to discuss ______.
A．how the U.N. scientists can help the Africans away from AIDS
B．the three problems that will occur in Africa in the next 20 years
C．how AIDS will impact Africa without effective policies against it
D．the achievements made by the U.N. scientists on AIDS in Africa
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