单项选择题

61, 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 analyse 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
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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 out for impoverished nations
单项选择题
Why does the author say that the protection of endangered species is a highly controversial issue
A．Because people can't agree as to what species to protect.
B．Because it is difficult to find an effective way to protect such species.
C．Because it affects the interests of certain groups of people.
D．Because it is a major problem involving a series of legal procedures.
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