Historically, the depletion of soil’s nitrogen has been one of

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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、ubiqutious
C、worrisome
D、stubborn
E、intractable
F、upredictable

答案：D,E

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