2. 外语
  3. Historically, the depletion of soil’s nitrogen has been one of the most________problems faced by farmers: an essential nutrient,

Historically, the depletion of soil’s nitrogen has been one of the most________problems faced by farmers: an essential nutrient,

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问题 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
选项
答案D,E
解析 逻辑连接标志是冒号，表示前后同义重复。前面说从历史上看土壤中氮的损耗(depletion)一直是农民面临的最________的问题之一，后面说作为必不可少(essential)的营养物质，氮元素很快从土壤中流失(leached from soil)，农民们很难找到方法(struggled to find ways)去补充它。氮元素很重要，从土壤中流失后又很难找到方法补充，因此空格表达“问题棘手”的含义，选项符合预期的是D项stubborn和E项intractable(棘手的)，这里stubborn(difficult to deal with)和intractable(not easily managed，controlled，or solved)指“问题难处理的，难以解决的”。C项worrisome“令人担心的”也可以说得通，但是没有同义词。
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