各位大牛，求助。。。。

wangli0089

GWD TN2的第17题，water-conserving那题，是怎么个逻辑关系啊？看的我是晕晕呼呼。。。。帮忙啊。。。

wangli0089

补充题目如下：GWD3-Q17:
Brochure:  Help conserve our city’s water supply.  By converting the landscaping in your yard to a water-conserving landscape, you can greatly reduce your outdoor water use.  A water-conserving landscape is natural and attractive, and it also saves you money.
Criticism:  For most people with yards, the savings from converting to a water-conserving landscape cannot justify the expense of new landscaping, since typically the conversion would save less than twenty dollars on a homeowner’s yearly water bills.



Which of the following, if true, provides the best basis for a rebuttal of the criticism?

A.Even homeowners whose yards do not have water-conserving landscapes can conserve water by installing water-saving devices in their homes.

B.A conventional landscape generally requires a much greater expenditure on fertilizer and herbicide than does a water-conserving landscape.

C.A significant proportion of the residents of the city live in buildings that do not have yards.

D.It costs no more to put in water-conserving landscaping than it does to put in conventional landscaping.

E.Some homeowners use more water to maintain their yards than they use for all other purposes combined.