2. 外语
  3. The ______ of human knowledge are being pushed further.

The ______ of human knowledge are being pushed further.

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问题 The ______ of human knowledge are being pushed further.
选项 A、boundaries
B、borders
C、limits
D、edges
答案A
解析 易混词辨析。boundary指地图上标明的定界线或分界线，其常具有的引申意义是“范围、领域和边界”，所以该句意为“人类知识的领域在进一步扩大”。border则强调两地、两主权国或两单位间的分界；limitation为“限制、局限”之意；edge则意为“边缘”。
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大学英语四级

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