单项选择题

What is the purpose of this study

A．To record social habits
B．To analyze anti-social behavior
C．To analyze frequency and purposes of social gatherings
D．To analyze frequency and purposes of keeping diaries
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单项选择题
Based upon the content of the article, it can be assumed that the writer ______.
A．would actively involve herself in actions designed to bring the rain forest problem to the attention of governments worldwide
B．has little interest in the destruction about which she is writing
C．obtained a few facts and produced a story with no basis in reality
D．is only satisfied when creating stories which are intended to frighten people
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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