单选题
According to the passage, why has general knowledge of botany begun to fade?
A、
People no longer value plants as a useful resource.
B、
Botany is not recognized as a special branch of science.
C、
Research is unable to keep up with increasing numbers of plants.
D、
Direct contact with a variety of plants has decreased.
【正确答案】
D
【答案解析】
[分析] 原因推断题。根据第二段第一句Unfortunately…grows．原文的the less distinct与本题用的 fade 意义相同，均为“生疏”之意。A项与原文相反。B项内容仅涉及亚马逊丛林的部落。本文未涉及C项内容。
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