单选题The author implies that topsoil is lacking in nutrients for which of the following reasons?I. The repeated planting of the same crops every yearII. The high acid content of slug trailsIII. The lingering after-effects of certain pesticidesAI onlyBII onlyCI and III onlyDI, II, and IllENone of the above
单选题
The author implies that topsoil is lacking in nutrients for which of the following reasons?I. The repeated planting of the same crops every yearII. The high acid content of slug trailsIII. The lingering after-effects of certain pesticides
A
I only
B
II only
C
I and III only
D
I, II, and Ill
E
None of the above
参考解析
解析：
文中第四段提到I中的内容。同一段中还提到III中的陈述。文中没有涉及II中陈述，故选C项。
文中第四段提到I中的内容。同一段中还提到III中的陈述。文中没有涉及II中陈述，故选C项。
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