标题: 请教费费讲的两道题 [打印本页] 作者: superdanouc 时间: 2010-10-23 22:46 标题: 请教费费讲的两道题 Canadians now increasingly engage in "out-shopping," which is shopping across the national border, where prices are lower. Prices are lower outside of Canada in large part because the goods-and-services tax that pays for Canadian social services is not applied. Which one of the following is best supported on the basis of the information above? (A)If the upward trend in out-shopping continues at a significant level and the amounts paid by the government for Canadian social services are maintained, the Canadian goods-and-services tax will be assessed at a higher rate. (B)If Canada imposes a substantial tariff on the goods bought across the border, a reciprocal tariff on cross-border shopping in the other direction will be imposed, thereby harming Canadian businesses. (C)The amounts the Canadian government pays out to those who provide social services to Canadians are increasing. (D)The same brands of goods are available to Canadian shoppers across the border as are available in Canada. (E)Out-shopping purchases are subject to Canadian taxes when the purchaser crosses the border to bring them into Canada. 用排除法，我可以做出来，但是A为什么是对的那？ Twenty percent of all energy consumed in the United States is consumed by home appliances. If appliances that are twice as energy- efficient as those currently available are produced, this figure will eventually be reduced to about ten percent.The argument above requires which of the following assumptions? (A) Home-appliance usage would not increase along with the energy efficiency of the appliances. (B) It would not be expensive to produce home appliances that are energyefficient. (C) Home-appliance manufacturers now have the technology to produce appliances that are twice as energy-efficient as those currently available. (D) The cost of energy to the consumer world rise with increases in the energy efficiency of home appliances. (E) The percentage of energy consumed by home appliances will increase if existing appliances are not replaced by more energy-efficient models. 为什么C不行，是因为C不对还是不如A好 希望得到各位的帮忙 3Q作者: alicejingli 时间: 2011-2-22 12:04
也想问第二个作者: lujie21 时间: 2011-2-22 13:35
Q1 推理链 从题目来看 不用付 Good & Service Tax － 造成境外购物的风气，影响 － 减少Good & Service Tax的收入 答案A 给了两个前提 ： 要保持Good & Service Tax的收入＋而且更多境外购物的现象 推出结论： （在总数不能减少的情况下）提高Good & Service Tax率来承担单位减少的损失 Q2 有效使用能源 造成 能源使用量减少。 简单说，功率 x 时间 = 工作量 要保证时间减少的前提是 功率 提高和工作量不变。 现在题目中其中一个前提 （功率 提高）已经有了，答案只有A，其它都是无关的作者: ourscorpio 时间: 2012-4-18 20:52
个人认为：假设题应该是加上一个必要条件满足结论，不需要否定条件，已经说if~~~了~
