请问划线部分末位的than they were这里为什么用were不用did？

调整语序

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Moreover, population ecologists' attempts to alter cycles by changing the caterpillars' habitat and by reducing caterpillar populations have not succeeded。答案从这句中来。作者通过陈述两件事来说明caterpillar的population cycle与自身关系更大而与环境或者天敌无关。一，天敌population cycle与 lepidoptera 的population cycle不相关；二，改变caterpillars的栖息地不能改变population cycle. 所以b削弱二自然是削弱来作者的结论。

provide an example to support the argument presented in the first paragraph。 example = capital-intensive industry.唉。。。。这也能选错。

key word = 'throughout' ，关注在flow of goods 而不是'production efficiency of goods' 所谓的 on tangible capital的部分。又忽略了关键词。

1.they指代不清，有歧义，指paleontologists还是fossils

2.比较对象不一致 fossils are older than types错❌，必须加 older than those of any similar dinosaur type

3.B，两个宾语从句错announced that……and they were……，后句应该和前句在一个宾从中
且they were at least 25 million years older than，陈述客观事实应该用现在时are

4.逗号问题，同位语前面肯定可以加逗号，ABC中，两个并列的句子加不加逗号 不知道……
Type前有any，用单数比较好
types that were previously，定从多余，直接previously found in North America简洁

fossils of some of the biggest armored dinosaurs ever found, fossils that are at least 25 million years older than those of any similar dinosaur type previously

结构：主句，同位语+定语从句

是同位语，但不是同位语从句。
同位语从句是：the fact that A do B。这里的that A do B叫同位语从句。
同位语是用一个名词来同位于另一个名词，甚至一个句子。例如
Trump, the president of USA, is a man.
这里的the president of USA就是Trump的同位语。同位语本身不要求抽象名词什么的。这道题目就相当于是一个这样的同位语，只不过名词身后还带了一个自己的定语从句罢了。

主谓隔着两个修饰语，第二个修饰语可能修饰第一个修饰语中的词，有歧义

C选项and thus no long having,分词状语，表it has set aside enough for payment of environmental claims的结果
不是比E选项的and表并列要好吗？

Ron认为现在完成时和现在进行时都ok，但是尊重原句。尊重原句啊！！
the past perfect makes perfect (heh) sense here. the idea is that, lately, the women have been receiving support from labor.
the present participial form "are receiving" would also make sense, but remember that you aren't supposed to change the meaning of the sentence without a good reason for doing so.

老师，我这道题做10遍错10遍，到底是生命中缺了什么o(╥﹏╥)o

虽然选对了，但真的纠结了很久，感觉没有特别好的答案。如楼下所说，其实老师偷换了概念，原来的结论是Croton's jays没有向南的方向感，而不是没有方向感，但是答案没一个相关的。
我跟老师的原因有区别，我选C是因为，原来的推论有个假设就是jay这种鸟往南的时候跟着crookbeak不是除了缺乏方向感以外的原因which是不可替代的；而C正好排除了这个原因，就是他回来的时候跟着另一种鸟，说明只是跟着别人就可以了，没有什么其他不可替代的原因（比如A提到的筑巢这种）。。。
我的分析，轻拍~

In triangle OAB , Angle O + Angle A + Angle B = 180 -------1
OA = OB (Radius) => Angle A = Angle B
In triangle ACB, Angle C = Angle O + Angle OAC (Sum of interior opposite angles)
=> Angle ACB = 2x;
Also, AC = AB => Angle ACB = Angle ABC = 2x each
Thus Angle A = Angle B = 2x each.
So, substituting in 1
5x = 180 => x = 36 deg.

想窄了

请问老师宾语从句中that可以省略么？比如I am confident they can safely handle new debt.这个表述正确么

请问老师宾语从句中that可以省略么？比如I am confident they can safely handle new debt.这个表述正确么

B.Many medical conditions and treatments that adversely affect a person's mental sharpness also tend to increase that person's social isolation.
看清从句that修饰药物治疗，affect a person's mental sharpness 和后面的increase that person's social isolation.不是平行的而是因果（导致）的关系：使智力下降的药物治疗→社交孤独

Suffice 足够

B选项：Correct. 很多影响人们智力的治疗也会提升人们的社会孤独。本选项同时提到了推理文段的因和果。给出了一个因果的方向问题，即，可能是因为人类智力的下降导致的社会孤独，而不是因为接触社会导致的智力保持。

结论：接触社会多→智力高 A→B
选项B:智力下降→接触社会少 B→A

属于CQ3：因果方向问题。=因果倒置