A. show that organic crops are safer than conventional ones B. be specially trained C. improve soil quality D. poison you E. be

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问题 A. show that organic crops are safer than conventional ones
B. be specially trained
C. improve soil quality
D. poison you
E. be eaten
F. affect their nutritional content
Techniques of organic farming help______.

选项

答案C

解析 题意:有机耕作技术帮助改善土壤质量。文章第二段第二句指出,像作物轮种这样的技术能够提高土壤质量,帮助有机农弥补因不施化肥造成的损失。C项“improve soil quality”(改善土壤质量)与原句意思相符,故选C。
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