( Based on the growth rates of large modern reptiles such as ) the Galapagos tortoise and examination of fossils of juvenile dinosaurs, scientists estimate that the larger dinosaurs probably lived to be between 100 and 200 years old. A. Based on the growth rates of large modern reptiles such as B. On the basis of growth rates of large modern reptiles such as C. Based on the growth rates of large modern reptiles like D. On the basis of growth rates of large modern reptiles, like those of E. Based on the growth rates as those of large modern reptiles like 答案是B，错选了A。科学家基于爬行动物的生长率，估计了恐龙的存活时间。科学家做based on的逻辑主语有错吗？麻烦老师讲解。 (Based on account of various ancient writers) , scholars have painted a sketchy picture of the activities of an all-female cult that, perhaps as early as the sixth century B.C, worshipped a godness known in Latin as Bona Dea "the good goddess". A. Based on account of various ancient writers B. Basing it on various ancient writer's accounts C. With accounts of various ancient writers used for a basis D. By the accounts of various ancient writers they used E. Using accounts of various ancient writers 答案是E，还是错选了A。做题时在AE纠结了好久，因为不确定学者作为“基于不同作家的解释”的主语是不是错的，而且感觉基于要比使用的表达更好，尽管可以确定using的主语是学者，但还是把E排除了，麻烦老师讲解。 因为不知道这两道题是犯了什么错误，所以去有道查了based on 的例句，发现人是可以做主语的：Based on the finding, one might predict that the bank should increase its display and budget. 以及 Based on that representation, the district judge denied a motion to dismiss the new comlaint. 麻烦老师讲解这几个题的区别。

老师，麻烦讲解一下。

老师，这个题的思路里，p(r)那个式子不应该是等于 —1/24吗

老师，麻烦讲解一下。

老师，麻烦讲解一下。

It is an oversimplified view of cattle raising to say that ( all one has to do with cattle is leave them alone while they feed themselves, corral them, and to ) drive them to market when the time is ripe. (A) all one has to do with cattle is leave them alone while they feed themselves, corral them, and to (B) all one has to do with cattle is to leave them alone to feed themselves, to corral them, and (C) all one has to do with cattle is leave them alone while they feed themselves and then corral them and (D) the only thing that has to be done with cattle is leave them alone while they feed themselves, corral them, and (E) the only thing that has to be done with cattle is to leave them alone while they feed themselves, to corral them, and 答案是C，看到原文all one的时候很困惑，不知道指什么，再看到后面的they feed themselves直接就把A排除了，感觉指代有问题，然后竖着扫了一下，发现ACDE都是这种表达，而且B乍一看太平行了，尽管句末少了一个to，当时的想法是 就算有to也不敢选，因为不确定to leave them alone to feed themselves是否改变了句意，所以就不知道该选什么了。麻烦老师讲解。

Although it was expected that workers under forty would show hostility to the plan, the research report indicates that both ( younger and the older people ) approve of governmental appropriations for Social Security. (A) younger and the older people (B) younger people and the older (C) the younger and the older (D) younger and older people (E) people who are younger and those who are older 答案是D，错选了C。the加形容词不是可以表示一类人吗？而且感觉C在句意表达清楚的前提下看起来也比较工整。C和D的区别在哪？麻烦老师讲解。

A majority of the international journalists surveyed view nuclear power stations as unsafe at present but ( that they will , or could, ) be made sufficiently safe in the future. A. that they will, or could, B. that they would, or could, C. they will be or could D. think that they will be or could E. think the power station would or could 答案是D，错选了E。我对D的理解是这帮人认为现在核发电站是不安全的，但是认为将来他们可能是安全的。排除D是感觉they的指代有问题，不确实是在说这帮人还是核发电站。麻烦老师讲解。

In metalwork one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bonding, is effected continuously over a broad surface ( instead of ) a series of regularly spaced points with no bonding in between. A. instead of B. as opposed to C. in contrast with D. rather than at E. as against being at 答案是D，这五个选项都不同，无法根据差异对比，而且对句意的把握也不太清晰，不知道该如何下手。麻烦老师讲解。

For some birds the sense of smell appears to paly a role in navigation, since pigeons with surgically removed olfactory nerves ( were found to have increased difficulties ) in homing. A. were found to have increased difficulties B. have been found to have increased difficulty C. were found to have increasing difficulty D. had been found to have increased difficulties E. have been found to have increasing difficulties 答案是B，我选的A。不明白为什么要用现在完成时，而且感觉困难应该是复数。麻烦老师讲解。

Those with a cynical turn of mind might ( speculate if the new corporation, eager for profit, might not have started ) the rumor that caused its competitor to declare bankruptcy. (A) speculate if the new corporation, eager for profit, might not have started (B) speculate if the new corporation, eager for profit, had not started (C) speculate if, in its eagerness for profit, the new corporation started (D) wonder as to whether, in its eagerness for profit, the new corporation did not start (E) wonder whether the new corporation, eager for profit, had started 答案是E，错选了B。做题时完全没有读明白句子意思，把speculate当成了spectacular，而且把if翻成了如果，怎么看怎么不顺，麻烦老师讲解。