我的理解如下，刚刚开始复习，看到你的题顺便做下，仅供参考.
Criticism:For most people with yards, thesavings from converting to a water-conserving landscape cannot justify theexpense of new landscaping, since typically the conversion would save less thantwenty dollars on a homeowner’s yearly water bills.
(disagree to convert to water-conserving landscap, concern focus on economically )
Which ofthe following, if true, provides the best basis for a rebuttal of thecriticism?
(要反对Criticism，也就是说要找那个方面water-conserving 比conventional省钱)
- Even homeowners whose yards do not have water-conserving landscapes can conserve water by installing water-saving devices in their homes.
- A conventional landscape generally requires a much greater expenditure on fertilizer and herbicide than does a water-conserving landscape.（conventional landscape在fertilizer&herbicide方面比较贵，water-conserving 便宜）
- A significant proportion of the residents of the city live in buildings that do not have yards.
- It costs no more to put in water-conserving landscaping than it does to put in conventional landscaping.（water-conserving和conventional需要的钱一样，不能说明water-conserving就好）
- Some homeowners use more water to maintain their yards than they use for all other purposes combined.
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