Generalization 后面that 同位语从句修饰这个整个概括的内容。 Idiomatic usage. In the phrase 'little of X', the X has to be a singular quantity. If it's plural (like 'differences'), then you have to use few.
There was very little food left over at the end of the party.
There were very few crab cakes left over at the end of the party.
in this sentence, "little" functions as a noun. you can use "much" in the same way: there is much that is different...

原文：更多交往导致更好精神技能。 b：影响精神技能的药物导致社会孤独。削弱

这题是因果倒置

less than 2.8% or ["2.8% is lower than the percent for last quarter]. some uncountable nouns are plural. for instance, "taxes" is a plural noun, but the concept that it represents is uncountable (taxes are not things that you can separate into one, two, three,...)so, you would say my taxes are less than they were last year, not [i]my taxes are fewer than they were last year[i].

this situation -- a state that is ongoing only until another past event, and which is directly related to that past event -- is precisely the kind of situation that requires the past perfect tense, so the sentence should contain "had expected", as in the first two choices. 另外c里it指代错误= profits

原文：因：产生抗金属的酸，使土壤金属产生惰性；果：可以在这个土壤中存活。 疑问？是否其他可以在这个土壤中生存的植物也是因为产生酸呢？

哦哦哦哦，这道题我理解错了，我以为他们想要wider seat什么的是想多花一些钱升级到商务舱，哎呀呀，原来是提高经济仓的质量

说明结果问题，果因推理，结果是，单票出席率高，套票出席率低，原因是什么，每张票便宜不唯一理由，没有直接建立关系。表演前开始买，出席率很可能高

第一个陈述的是environmentalists’的观点，第二个陈述的是economist’s的观点，开头Economist:，这段话是Economist说的。我把D的前后两个看成一样的了…以为它在搞笑…

A选项：举出一个琥珀在之前如何被误解的例子：P的看法是正确的，没有误解琥珀。

E选项：学者首次研究植物的趋避效果是在1950s：1950s的时候学者推断resin的作用是抵制或吸引昆虫，但没有提是不是第一次。

increase by！！！！！

C选项：是driving force：在新技术出来之后，学者才确认病毒是driving force，而不是之前。

E选项：解释为啥大型生产设备经常不能帮助制造商实现规模经济：文章主要在强调无形资产的重要性。

B选项：主要由饮食专家授粉：没提。

D选项：文章展示了一些近期发现以此挑战某理论：为什么柱状仙人掌扩大了它的传粉者队伍：文章是在讨论why扩大，但这里并没有新观点在挑战旧观点。

A选项：展示了Arboria在世界市场上的地位削弱：Arboria的地位衰退是整体文章针对的一个现象，但作者的本意不仅仅是描述这个现象，更重要的是指出背后的原因和警示政策指定人采取相应的措施
C选项：鼓励对Arboria外贸政策的重新评估：作者指出Arboria现在存在的不足，目的是为了让其认识到不足并且采取相应措施。

哈哈直播的人比较少~不是不想搭理你哈老师~ 讲得非常好滴

I like D better here. E introduces the word "possibly" which has a different meaning than "it can serve." The "it can" means it is, really, while "possibly" means it might. Not the same thing. And the original sentence uses "can" so I want to preserve the meaning.

Also the construction "in fact possibly serving" is awkward.

a is wrong because of the participle 'placing', which wrongly indicates that this trend is already placing more women in leadership positions.
c is wrong because the relative pronoun 'which' is placed in a position where it must refer to 'women'. this is wrong for 2 different reasons: (a) 'which' can't refer to people, and (b) according to the sentence, women don't place themselves in leadership positions; the trend does.