試題詳解

47. Why is the soil in the cotton fields also slowly being ruined?
(A) With too much water added to the cotton field, a layer of salt has formed on the surface of the soil.
(B) Too much snow falls on the desert every year, thereby destroying the soil.
(C) The farm chemicals do extensive damage to the desert where cotton crops are cultivated.
(D) The polluted air hangs over the cotton fields, thereby ruining the soil.