GWD logic

sarahfuzq

1 Press secretary - Our critics claim that the president's recent highway project cancellations demonstrate a vindictive desire to punish legislative districts controlled by opposition parties.  They offer as evidence the fact that 90 percent of the projects cancelled were in such districts.  But all of the cancelled projects had been identified as wasteful in a report written by respected nonpartisan auditors.   So the president's choice was clearly motiated by sound budgetary policy, not partisan politics.

Which of the following is an assumption on which the press secretary's argument depends?

答案是
the scheduled highway projects identified as wasteful in the report were not mostly projects in districts controlled by the presidents's party.

这句不就是原文上述划线句已经说过的吗？ 为什么还是假设？

2 Although the discount stores in G central shopping district are expected to close within five years as a result of competition from a SpendLess discount department store that just opened, those locations will not stay vacant for long.   In the five years since the openining of Colson's, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson's.

Which of the following, if true, most seriously weakens the argument?

答案是
increasingly, the stores that have opened in the central shopping district since Colson'sopened have been discount stores.

为什么weak了？  请教

3 Scientists have made genetic modification to cotton to increase its resistance to insect pests.  According to farmers' report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modiefied seed than for those who did not.   Therefore, since the modified seed costs more than ordinary sees without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.

Which of the following would it be most useful to know in order to evaluate the argument?

答案是
Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did.

为什么这样评估，相关吗？ 如何解释？

谢谢

sarahfuzq

为什么没人理我？？？

南蛮也爱球

为什么其他选项不写出来排除对比呢？