当they are compelling时候正在disturbing， 而不是have been一直disturbing

c 选项说：不像有些鱼，有蛋，其蛋需月而能化.....这不搞笑呢

D is better than B in this case - because the two things actually are interrelated. If SW education is in the university, then students can be offered a broad range of courses. (Note that the original sentence uses a set-up that also indicates this interrelationship: do the first thing so that the second thing can happen. They're making very clear that these two things are interrelated.)

A是在帮助防止利润下降，B和C无关，D说每期广告费不变，但是期数降低一半后，广告收入(广告商数量不变)也降低一半，故可能导致利润下降，e说成本不变，现在减以前抵消，不影响利润改变，排除

the most objective error in choice (e) is its use of "little" for a quantity of differences.
differences (like virtually all plural nouns) are countable, so you can't use "little" to describe them. if this choice said few significant differences, it would be legitimate.

选了C，为何不对呀，是说encourage而已而实际有没有做是另一回事吗

e.g., my grandmother doesn't like the idea of combat sports.
in the case of generalization, though, you can't follow it with "of" + noun, because generalizations aren't represented by nouns -- they are represented by statements (clauses). you can introduce a clause with "that", but not with "of".

ABC
this is just idiomatic. fortunately, it's pretty much consistent across the board for words that refer to things that people say or think. for example, you would use the same construction with the idea that..., the saying that..., etc..
some of these constructions can also work with "of" + noun, if that kind of thing makes sense in context. for instance, idea + of + noun can be used:

a 第一分句中的an average of 419more pay 与第二分句中的a ratio of 42times 无法对比

https://www.manhattanprep.com/gmat/forums/on-account-of-a-law-passed-in-1993-making-it-a-crime-punish-t3096.html

Since不是因为，是自从。。

human. Ticks. white-foot mice. biodiversity. only the C answer covers all the factors, but A only covers human and ticks. so comparably, C is better than A. But I still choose A:(

环境灾难导致桂鱼

unusually 非常地

老師, 請教一下"uncovering vast new areas..."這個是伴隨狀語嗎?如是, 我想了解伴隨狀語的動作不是必須發生在主句謂語之前/同時間嗎?但“揭开新的地方”應該是“冰盖开始融化”之後。

如果去掉B选项两个of, 变成presence of a buried crater, the element iridium (originating deep within the earth), and quartz 是否一样正确？

再刷这个题，感觉这个“ a building undergoing being converted to cooperative ownership ”跟“a building undergoing conversion to cooperative ownership”意思是不是不太一样呢？
前者是a building undergoing （it）being converted to cooperative ownership，意思是这个楼被转换成合伙制。
后者“ to cooperative ownership”应该做宾补修饰conversion，这个转换是变为合伙制
不知道能不能这么想呢？。。

不得不说GMAT太严谨了，D、almost

想问一下C选项，有没有found和surviving主动和被动不能并列的问题呢