2. 外语
  3. The plant species that Dr. Kinghorn discovered in Puerto Rico proved to be ______to his medical research.

The plant species that Dr. Kinghorn discovered in Puerto Rico proved to be ______to his medical research.

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问题 The plant species that Dr. Kinghorn discovered in Puerto Rico proved to be ______to his medical research.
选项 A、joint
B、useful
C、precise
D、competent
答案B
解析 根据上下文语义，此处意为“发现的植物种类证实对医学研究有用”，因此应选形容词(B)useful(有用的)。(A)joint表示“共同的”，(C)precise表示“精确的”，(D)competent表示“能干的”。
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