The ______ of human knowledge are being pushed further.A、boundariesB、bordersC、

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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 B

解析 近义词辨析。本题四个选择项都有“边”“界”之意,但boundary分界、分界线,border边、缘,limit界限、限度,edge边、边界,依题意选B。
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