C，simply是修饰are的，如果把are去掉，simply就变成了一个orphan！
random by-products随机副产品
许多生物特征并不是自然选择的产品，而只是简单地是其他进化发展的随机副产品。

D/E
主句是还不清楚动物是否会展现出相似的行为模式。
D动物被研究作定语修饰animals，E当这些动物被研究的时候，作状语，修饰exhibit。
这里暗含的意思是，patterns是否显示出来与动物是否被深度研究是有逻辑关系的，之前没有显示出来可能是因为研究不够深入，所以现在unclear如果深入研究的话，是否会显示出来。
只能这样去理解了，救命啊，脑壳疼。。。

While in her prime是主谓省略的形式，while前出现的句子主语是her career，还原到该句中为while her career was in her prime，逻辑含义不合理，应该是Olive Fremstad本人两个in her prime。

假设的是不是因为大学生少而工资高，未来几年大学生毕业人数增加，只要是大学生，工资都高。

不知道选什么答案的时候，一定要仔细读完每一个选项

C和E都区别，C里面its paying，paying作修饰修饰医生，falling in 医生是不对的，E里面paying是动名词。

同一个句子中一个代词出现两次时，他们指代的必须是同一个东西。
Wrong: The results of the company's cost- cutting measures are evident in its profits, which increased five percent during the first three months of this year after it fell over the last two years.
Its指代the company，it指代the company，company不会fall，是profits fall，句子逻辑错误

有犹豫选项的时候一定多看看原文premise。

freight cars can be transported to Burland by barges that typically cross the channel in an hour，这个前提为真的情况下，汽车交通情况就不需要考虑，因为一定是在1个小时内就可以完成的。所以这个理由无法攻击。

1、passage文章，还有通过的意思，pass的名词
B，against those who register domain names with the sole intent that they will sell them later，
they sell them，到底是谁sell谁？指代不清，有歧义

don\'t need \'and\' if you use \'after which\' (no need for 2 linking words/phrases)
- redundancy: \'after which\' means the same thing as \'subsequently\', so having both is fatal
- \'because of\' is sketchy; it suggests indirect causation, while the clear meaning is that gravitational attraction was directly responsible

after which "preposition + WHICH" plays the same modifying role as does plain "which" -- namely, it modifies the noun preceding the comma. With "after which," you are referring to a period of time - one thing or event taking place after another thing or event. in the correct answer, "after which..." correctly modifies the immediately preceding noun "(repeated) impacts".

or so表示对数字的不精确估计 We have to leave in five minutes or so.I stopped reading after thirty or so pages.

incidentally, in the official correct sentences, i\'ve never seen \'as well as\' followed by anything other than a noun. (remember that \'__ing\' can be a noun; that\'s the role played by \'emitting\' here.)

i wouldn\'t elevate this to the status of a \'rule\', since as well as is also widely used to connect other things, such as adjectives (His review was insightful as well as thorough

1，动词有action noun形式时，不要用complex gerund来表示动词的名词形式，比如growth，不要用the growing
2、when+现在/过去分词是状语，逻辑主语是主句主语
3、neurogenesis是神经发生，神经形成的意思，the production of new brain cells指新细胞的产生，production，产品，也可以指生产，产生

just as A do, so do B

C，Unlike cooking with spices, taking spices for medicinal use is done in large quantities in order to treat particular maladies.
句子的主语是taking spices，for medicinal use作定语修饰主语，类似于to do做定语，如I have many letters to write或We have made a plan to learn from Jack
C简化下就是taking spices unlike cooking，比较对象错误。

A，patterns of stress that girls experience是个定语从句，that在从句里充当宾语
B，what boys experience是个名词，从比较结构上是可以的，A is more exciting than B（比较省略的原则在于是否会引起歧义，不一定要带上谓语动词或助动词）
但B的逻辑意思不对，what boys experience可以是男孩经历的一切，不特指patterns of stress，而原文要比较的事patterns of stress that girls experience are……than patterns of stress that boys experience

1、fortunately,转折。前面将人们遭受了大剂量的neutrinos，后面来一个fortunately，幸运的是，这些neutrinos是无害的。
2、C，and which找不到定语从句跟它平行

1、表命令语气的词后面接的词原型，demand that sb do sth
2、spend only on……not on……的结构平行