2. 外语
  3. Classification is a useful ______ to the organization of knowledge in any field.

Classification is a useful ______ to the organization of knowledge in any field.

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问题 Classification is a useful ______ to the organization of knowledge in any field.
选项 A、means
B、approach
C、mode
D、manner
答案B
解析 B approach作“方式，方法；态度”讲时，后接介词to，而其他几个选项都没有这种用法，故 B 为答案。
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