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单选题
A
To transport water to high places.
B
To provide air conditioning.
C
To fertilize the soil.
D
To adjust the soil temperature.
参考答案
参考解析
解析：
[考点]推断题。录音指出，他们把管子插进土壤中，这样冷水就会降低土壤温度，选项D与此句同义替换。
[考点]推断题。录音指出，他们把管子插进土壤中，这样冷水就会降低土壤温度，选项D与此句同义替换。
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