单项选择题

Which statement best expresses the main idea of the article

A．Many different kinds of medicine come from tropical forests
B．Virtually all of the world's rain forest has already been destroyed
C．Tropical forests are disappearing at an alarming rate
D．Tropical deforestation affects people in all parts of the globe
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单项选择题
According to the information contained in the article, tropical deforestation ______.
A．will continue relentlessly and cannot be prevented
B．may have critical consequences for the survival of mankind
C．is not a really serious problem and reports have been widely exaggerated
D．is necessary for the economic development of non-industrialized countries
单项选择题
It can be inferred from the article that the majority of tropical forests ______.
A．contain a few valuable plants which possess curative properties
B．are of little interest to scientists involved in medical research
C．could be the source of a cure for life threatening diseases and various health problems
D．as a region produce only one percent of modem medicines
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