400-600-1123
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答案：
B
此题主要
1.问题陷阱：rebuttal是问对“water－conserve land不省钱“的反驳，也就是答案要支持这个新方案是省钱的。
2.根据cost就可以锁定答案在BD。
B 正确，反驳因为老款的涉及到肥料除草剂这些会更多cost，正好驳斥掉观点。
D 比的cost不是put in，而是conversion，排除。
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