单选题
"Top soil" means ______.
A、
useless soil
B、
soil found under the earth
C、
soil on the surface of the earth
D、
dry soil which is found in the desert
【正确答案】
C
【答案解析】
依据第三段第二句“…preventing good and fertile top soil from being washed away…”……防止肥沃的上层土壤被大雨冲走。所以C是正确的。
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