单项选择题

According to the passage, what truely results in the impoverishment of the developing countries

A．The rapid growth of population.
B．The presenvation of rainforests.
C．The cutting of rainforests.
D．The conflicts between developed countries and developing countries.
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单项选择题
According to the passage, cutting trees to grow more food______.
A．will widen the gap between the developed and the developing countries
B．is but a short-term relief to the food problem
C．can hardly alleviate the shortage of food
D．proves to be an effective way for impoverished nations
单项选择题
Conrad and his group of AI researchers have been making enormous efforts to______.
A．find a roundabout way to design powerful computers
B．build a computer using a clever network of switches
C．find out how intelligence developed in nature
D．separate the highest and most abstract levels of thought
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