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题目内容双击单词支持查询和收藏哦～
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.
- A.capricious
- B.ubiquitous
- C.worrisome
- D.stubborn
- E.intractable
- F.unpredictable
D,E显示答案
以上解析由 考满分老师提供。
