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题目内容
Historically, the depletion of soil`s nitrogen has been one of the most _____________ problems faced by farmers: an essential nutrient, nitrogen is quickly leached from soil, and farmers have struggled to find ways to replenish it.
- Acapacious
- Bubiquitous
- Cworrisome
- Dstubborn
- Eintractable
- Funpredictable
D,E显示答案
以上解析由 考满分老师提供。