a选项后面 generation of electricity and heating factories and homes， electricity和heating factories and homes不平行，同时mining heat 和producing energy不应该是平行关系，应该是具有一定的因果关系，所以排除
b同理
c后面enough for generating electricity efficiently and to heat不平行，同时前面用for不是特别好，因为第一次挖出来热能会影响到后面的有效采集，用不定式控制力应该更强
d，不定式用的正确， enough for generating electricity efficiently and for heating平行，完美答案
e，前面不定式没问题，后面for efficient generation of electricity and heat不平行，排除

现在时：be known to do
过去时：be known to have done

B的解释貌似有问题？题干说的是“Most of the customers of Martin's Cafe had never dined in Riverville before”，也就是说来M cafe吃饭的人从来没来过R这个地方，所以M cafe给R这个地方带来了新客源，从而使W Inn的sales提高，加之M cafe供不应求，余下的人就只能来W inn吃饭了

conclude to 到达
conclude by 通过……得出结论

contention 争论

OG关于D的解释：This comparison is faulty: The loss is not being considered in the context of total industry revenues but in the context of total sales of programs.
即，D选项比较的是全部盗版，而不是这个项目的盗版
且私以为比较后较小，或者占比较小，都不代表这个值本身小

ABD illogically compare beavers or the beaver populations to the eighteenth century.

C. The coordinating conjunction and introduces unnecessary words, as does the awkward phrase as compared to what it would be with . . . . The preposition with is incorrect.

A. Correct. Although not the most graceful sentence, this version correctly compares the rate at which birds huddled in groups burn energy with the rate at which they would burn energy as isolated birds

D. The participial finding has no agent in this version of the sentence. The preposition with makes the sentence wordy and nonsensical, as it is not clear what is being connected with the artifacts.

https://gmatclub.com/forum/discussion-of-greenhouse-effects-has-usually-focused-on-81888.html

“独立主格结构”在句中的功能类似于一个带有自己主语的状语从句。

d选项还是不太懂，为什么非限定性就意味着他的书不都是在法国写的

to have recorded中的have表示先时性，不表示完成时，即，record这一事件发生在said这一事件之前。这里改为to record也没有问题。

A. The it was. . . that. . . construction introduces additional words that do not contribute to meaning. If by far is intended to modify is better known . . . it should be placed after known, or set off by commas, to prevent far from seeming to go with better. If by far is intended to modify better, this is incorrect usage.

只要有点看不懂的…必错。这螃蟹和藤…这词汇让我撞墙= =

如果x＝0呢？ 这样（1）选项就有0和1两种可能了 对吗？

只看题目的话，是类比推理。但实际的答案并不是...- -

这道题目写错了哦

MARK. 选了E.
注意rise higher赘余；和比较对象不对等，独立主格一定不能乱用啊啊啊