求教 大全2-5,2-8

大全-2-8.    Teenagers are often priced out of the labor market by the government-mandated minimum-wage level because employers cannot afford to pay that much for extra help. Therefore, if Congress institutes a subminimum wage, a new lower legal wage for teenagers, the teenage unemployment rate, which has been rising since 1960, will no longer increase.

Which of the following, if true, would most weaken the argument above?

(A) Since 1960 the teenage unemployment rate has risen when the minimum wage has risen.

(B) Since 1960 the teenage unemployment rate has risen even when the minimum wage remained constant.

(C) Employers often hire extra help during holiday and warm weather seasons.

(D) The teenage unemployment rate rose more quickly in the 1970’s than it did in the 1960’s.（B）

(E) The teenage unemployment rate has occasionally declined in the years since 1960.

我觉得答案b也不对啊,应该是说即使最低工资下降了,失业率还是保持不变才对啊.

大全-2-5.    The city’s public transportation system should be removed from the jurisdiction of the municipal government, which finds it politically impossible either to raise fares or to institute cost-saving reductions in service. If public transportation were handled by a private firm, profits would be vigorously pursued, thereby eliminating the necessity for covering operating costs with government funds.

The statements above best support the conclusion that

(A) the private firms that would handle public transportation would have experience in the transportation industry

(B) political considerations would not prevent private firms from ensuring that revenues cover operating costs

(C) private firms would receive government funding if it were needed to cover operating costs

(D) the public would approve the cost-cutting actions taken by the private firm（B）

(E) the municipal government would not be resigned to accumulating merely enough income to cover costs

D为什么不对, B又为什么对?

还是不懂2-8.....我选C

作者在得出这个结论并没有假设unemployment rate 和 the minimum wage-level 一定是正相关的关系，作者只是假设了lower minimum wage 会使 unemployment rate 不再增长，所以B中 minimum wage-level 不变，但是unemployment rate 却一直在增长不能削弱the argument.

而C说雇主只在holiday 和 warm weather seasons才雇人，说明还有其它因素影响未来的unemployment rate,如果the minumum wage下降了，但是恰逢不是holiday或者warm weather seasons,雇主就不会雇佣人，unemployment rate就不会下降；即使恰逢holiday或warm weather seasons,但是holiday或warm weather seasons一过，unemployment rate一样会回到以前的增长水平啊。所以作者的结论（unemployment rate will not increase）被削弱了

？？？？急盼回帖

B选项中工资不变，失业率还是上升，说明两者一点关系都没有，当然WEAKEN到原文结论

C是无关，不管雇主在其他时候会不会多请人，也不能说明最低工资和失业率没关系

谢谢cocoamocha的回答,但是我还是转不过来

工资不变，失业率还是上升为什么能说明两者一点关系都没有呢?

文章不是说因为雇主们不愿意付那么多钱来雇佣extra help,所以teenage unemployment rate居高不下吗? 工资不变,雇主就不会雇佣extra help,同时进入teenage 年龄段的人越来越多,所以teenage unemployment rate会继续上升,这样并不能说明最低工资水平和失业率没关系啊? 所以B的情况并不排斥工资下降,失业率下降的情况

我是这样想的：
结论是条件性结论A (Congress institutes a subminimum wage)＝＝》B(unemployment rate will no longer increase)
要想削弱的话可以证明A不一定推出B，即即便institutes a subminimum wage，不一定unemployment rate will no longer increase。就是说证明unemployment rate and the minimum wage无关，或者有其他因素导致unemployment rate。
你CONFUSE的地方可能是你将原文的前提理解成：如果 minimum wage remained constant那么 unemployment rate will rise ，但是事实是如果unemployment rate and the minimum wage相关，那么minimum wage remained constant则unemployment rate也constant.B恰恰从这个角度证明二者不相关。

P.S：关于“同时进入teenage 年龄段的人越来越多”，可是退出TEENAGE的人也以同样的速度在退出嘛。所以RATE是不变的