15.
Capuchin monkeys often rub their bodies with acertain type of millipede.
Laboratorytests show that secretions from the bodies of these millipedes are rich in twochemicals that are potent mosquito repellents, and mosquitoes carry parasitesthat debilitate capuchins.
Somescientists hypothesize that the monkeys rub their bodies with the millipedesbecause doing so helps protect them from mosquitoes.

Which of the following, if true, provides themost support for the scientists’ hypothesis?
A.A single millipede often gets passed aroundamong several capuchins, all of whom rub their bodies with it.
B.The two chemicals that repel mosquitoes alsorepel several other varieties of insects.
C.The capuchins rarely rub their bodies with themillipedes except during the rainy season, when mosquito populations are attheir peak.
D.Although the capuchins eat several species ofinsects, they do not eat the type of millipede they use to rub their bodies.
E.The two insect-repelling chemicals in the secretionsof the millipedes are carcinogenic for humans but do not appear to becarcinogenic for capuchins.
答案是C，这题俺猜对咧，不过想知道怎么排除D？

20.Five years ago, as part of a plan to encouragecitizens of Levaska to increase the amount of money they put into savings,Levaska’s government introduced special savings accounts in which up to $3,000 a year can be saved with no tax due onthe interest unless money is withdrawn before the account holder reaches theage of sixty-five.
Millions of dollarshave accumulated in the special accounts, so the government’s plan is obviouslyworking.

Which of the following, if true, most seriouslyweakens the argument?
A.A substantial number of Levaskans have withdrawnat least some of the money they had invested in the special accounts.
B.Workers in Levaska who already save money inlong-term tax-free accounts that are offered through their workplace cannottake advantage of the special savings accounts introduced by the government.
C.The rate at which interest earned on moneydeposited in regular savings accounts is taxed depends on the income bracket ofthe account holder.
D.Many Levaskans who already had long-term savingshave steadily been transferring those savings into the special accounts.
E.Many of the economists who now claim that thegovernment’s plan has been successful criticized it when it was introduced.
这题，可不可以帮忙解释一下D是怎么对的？

31.The fact of some fraternal twins resembling eachother greatly and others looking quite dissimilar highlights an interesting andoften overlooked feature of fraternal-twin pairs, namely they vary considerablyon a spectrum of genetic relatedness.
A.The fact of some fraternal twins resembling eachother greatly and others looking quite dissimilar highlights an interesting andoften overlooked feature of fraternal-twin pairs, namely they vary considerably
B.That some fraternal twins resemble each othergreatly while others look quite dissimilar highlights an interesting and oftenoverlooked feature of fraternal-twin pairs, namely that they vary considerably
C.With some fraternal twins resembling each othergreatly and others looking quite dissimilar, it highlights an interesting andoften overlooked feature of fraternal-twin pairs, namely considerable variation
D.With some fraternal twins resembling each othergreatly and others looking quite dissimilar, it is a fact that highlights aninteresting and often overlooked feature of fraternal-twin pairs, namely aconsiderable variation
E.Because some fraternal twins resemble each othergreatly and others look quite dissimilar, this fact highlights an interestingand often overlooked feature of fraternal-twin pairs, namely they varyconsiderably
答案是B。这题虽然又蒙对了，但是不太明白句子结构，and是和谁并列呢？

谢谢！谢谢！

第一题，D和防蚊子没关系

第二题，结论说，因为收到了很多钱，所以**采取的那个措施很有效。
weaken的重点就是证明收到的那些钱不是因为**采取的这个措施收到的。
在**的policy里面说的是，有一种special account可以让account holder每年存入的钱里面的3000元不收利息税，但是前提是account holder在65岁之前都不能取出这些钱。

D说很多已经有长期存款的市民是把钱transferr到这个special account里面，也就是说他们并没有存另外的钱，也就是说银行存款的总量并没有变。所以新收到的那些钱都不是因为**的special account收到的，于是weaken了。

the fact of some fraternal twins resembling eachother greatly and others looking quite dissimilar
我觉得这里的and会产生歧义，是说“有些双胞胎很像的事实和有些双胞胎很不像的事实”还是说“有些双胞胎很像但是有些却很不像的这个事实”呢？原文明显是第二个意思，我觉得用while就很清楚了。而且本来就是一个转折语气，while更准确。

不知道P你问的是哪个"and"，第二个“and”的话，是interesting and overlooked，修饰feature

[ 本帖最后由 kichan5720 于 2008-3-4 00:38 编辑 ]

谢谢kichan！！快考试了还来帮我回答问题，太感动了！
最后一题俺是问第二个and，俺以为overlooked是overlook的过去时，俺在迷糊它和哪个动词并列

没啥没啥
看看人家错的地方也能多思考防止自己错XDDDDD
我倒是经常会把过去式看做过去分词作定语……平时看习惯用习惯了 Orz
P酱努力啊！