单项选择题

It can be inferred from the article that the majorty 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 cum for life threatening diseases and various health problems
D．as a region produce only one percent of modem medicines

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单项选择题

The method in which the writer believes is most effective for the poor benefiting from the rich is ______ .

A．amassing all products from the last two years and reallocating them
B．ensuring the majority of products available are more useful to the poor
C．offering low priced stock that the poor could 'afford
D．by limiting the buying of the rich

单项选择题

Why does the author give his opinion of the definition of poetry

A．He doesn' t want his readers to be confused.
B．He wants to get to his point and not discuss definitions.
C．Many people have tried to define it, and he wanted to add another by giving his point of view.
D．He doesn' t think the other definitions are accurat