单选题
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
【正确答案】
C
【答案解析】
文章提到人们研究了不到百分之一的热带雨林，就发现了很多中可利用的药物成分。所以不难推测，这些热带雨林可能是治疗致命的疾病和各种健康问题的良药。
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