请教两道逻辑题. 偶错了都不知道怎么错的.

Q14:

Political Advertisement:

Mayor Delmont’s critics complain about the jobs that were lost in the city under Delmont’s leadership.  Yet the fact is that not only were more jobs created than were eliminated, but the average pay for these new jobs has been higher than the average pay for jobs citywide every year since Delmont took office.  So there can be no question that throughout Delmont’s tenure the average paycheck in this city has been getting steadily bigger.

Which of the following, if true, most strengthens the argument in the advertisement?

The average pay for jobs created in the city during the past three years was higher than the average pay for jobs created in the city earlier in Mayor Delmont’s tenure.

Average pay in the city was at a ten-year low when Mayor Delmont took office.

Some of the jobs created in the city during Mayor Delmont’s tenure have in the meantime been eliminated again.

The average pay for jobs eliminated in the city during Mayor Delmont’s tenure has been roughly equal every year to the average pay for jobs citywide.

The average pay for jobs in the city is currently higher than it is for jobs in the suburbs surrounding the city.

   Answer: c 偶选b

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Q15:

Capuchin monkeys often rub their bodies with a certain type of millipede.  Laboratory tests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins.  Some scientists hypothesize that the monkeys rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

Which of the following, if true, provides the most support for the scientists’ hypothesis?

A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.

The two chemicals that repel mosquitoes also repel several other varieties of insects.

The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.

Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies.

The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins.

   Answer: e偶选c

请协助写出解题思路,这两道题死得真冤. 看着答案都不知道怎么错的

ARE YOU VERY SURE答案对吗？

第一个我选D，得再想像。

第二我同意C，确定。

想了一下，我觉得只有C，D有干扰。

以下只是个演示，请大COWS指正。

假设第一年，60人工作，平均工资80。

过一年，增加20人，平均工资1000（大些好证明），减少10人，平均80。

此时平均=（60 * 80 - 10 * 80 + 20 * 1000）/ 70 ＝　343

再过翌年，如果按照C，前翌年的新工作（1000的）减少19个，以前的平均80的减少1个，新增21个（多于减少）平均350（高与当年平均）的工作。

平均= （49 * 80+ 1＊1000+ 21 * 350 ）/ 71 = 173 《３４３。

如果是D，减的都是平均，新加的比平均高，新的平均会更高。

第1题是D, C不能形成充分条件

第2题是C, 非常明确

请牛牛指正!

同意第一题选ｄ　。　哈这样说我少错了一个提了？？　

你说的对阿，　所以说　减平均工资的和原来的持平，　新工作的平均工资的比原来的高

恰恰说明ｍ的能干阿　提高了城市人民的生活水平阿！所以应该选d 阿

是啊，本来就是D啊。

上面只是说C是错的。