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
The author's purpose in writing this passage is ______.
A．to describe the difficulties in solving humanity's current problems
B．to present the different views on humanity's current problems
C．to analyze the contradiction between countries in dealing with humanity's current problems
D．to point out that humanity's current problems can only be solved through the cooperation of nations
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
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