题目选项分析

Aroca City currently funds its public schools through

taxes on property. In place of this system, the city

plans to introduce a sales tax of 3 percent on all

retail sales in the city. Critics protest that 3 percent

of current retail sales falls short of the amount raised

for schools by property taxes. The critics are correct

on this point. Nevertheless, implementing the

plan will probably not reduce the money going to

Aroca's schools. Several large retailers have selected

Aroca City as the site for huge new stores, and these

are certain to draw large numbers of shoppers from

neighboring municipalities, where sales are taxed at

rates of 6 percent and more. In consequence, retail

sales in Aroca City are bound to increase substantially.



In the argument given, the two portions in boldface

play which of the following roles?

【选项】The first presents a plan that the argument

concludes is unlikely to achieve its goal; the

second expresses that conclusion.