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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