单项选择题

Why were only the months of January and July chosen to be coded

A．To make the task more idealistic.
B．These two months were appropriate representatives of the year.
C．These months gave more opportunity for visitation.
D．To make the task more realisti
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单项选择题
Which question is NOT answered in the article
A．How many plant species found outside tropical rain forests could be used in the treatment of cancer
B．Which plant has a product used for tile treatment of anxiety
C．Worldwide, what is the total annual production of synthetic rubber
D．Which rain forest plant can be used for the treatment of eye disease
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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