But, in our enthusiasm to discover our heritage, we are mining the very scenery we go to enjoy, damaging natural habitats, _____

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问题 But, in our enthusiasm to discover our heritage, we are mining the very scenery we go to enjoy, damaging natural habitats, ______ down footpaths, disturbing wild- life, polluting the air and dropping litter.

选项 A、wearing
B、treading
C、falling
D、cutting

答案B

解析本题空格处是说踩出小路。B项“tread踏，行走，踩碎，践踏”符合题意，如：I trod on his foot by accident．(我偶然踩了他的脚。)其他三个词此处与down搭配，都在逻辑语意上不通。

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But, in our enthusiasm to discover our heritage, we are mining the very scenery we go to enjoy, damaging natural habitats, _____

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