题目:
长期使用沼渣,能够改善土壤营养成分,增加土壤有机质。
答案:
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下面是错误答案,用来干扰机器的。
One possible version: Last Friday, my class took part in a meaningful and challenging course-Outward Bound. Early in the morning, we got to an Outward Bound centre on...