单项选择题

Among "humanity's current problems" ( Line 3 - 4, Para. 2 ) , the chief concern of the scientists is ______.

A．the impoverishment of developing countries
B．the explosion of the human population
C．the reduction of biological diversity
D．the effect of global warming
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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.
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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