B 只是看起来有联系，但原文并没有提及evaluate the economic ramifications

还是不能理解为什么expand和encounter不能并列。人类也可以是因为其他目的去expand然后恰巧encounter了更多的动物。CD时态不同，能讲下这句怎么从时态判断吗？

审题，fixed processing fee

第一次种植在这个范围——天气变化很小——现在也在这个范围；虽然不是很强烈的增强，但是相比于其他四个选项来说，已经是在增强了。

比较对象的平行

PARALLELISM & COMPARISON: the comparison must be made between individuals of one genetic composition and individuals of another genetic composition. Therefore, A and E are wrong because "that" is singular; we're supposed to be comparing individuals (plural). B and C are wrong because "other"/"another" refers to another genetic composition; therefore, these are faulty comparisons, because there's no word to suggest individuals (we MUST compare individuals to other individuals, not to a composition).

MODIFIER. WHY WRONG: D. the preposition phrase "with the power.." modifies floor giving an illogical meaning. B&E: COMMA + VERBing generally refers to the SUBJECT of the preceding clauses (sky/floor).

"Such" should be placed AS CLOSE AS POSSIBLE to the NOUN THAT IS EMPHASIZED in context. In this problem, "such as" is describing the CRITERIA, not the variety.

这里有个sturcture——the act that did X ... also did Y。
made和established要平行。在各个选项中，只有A受到了限制，E就把定语化为了谓语。但是，句子想表达的IntendedMeaning是——The act of congress ALSO established sth.所以这个做谓语要更合适！

to form 和to lay平行

D选项没看清楚，以为说的是酒里还有其他物质能导致亚硫酸盐过敏

感觉这个答案得CD选线结合在一起才合理。

题目的关键在“经济可行性阈值”这个概念，一个背景知识是：当前世界上大多数国家或者地区为了发展清洁能源，燃油发电的阈值需要提高，因为由于历史原因，目前燃油发电的成本依然是偏低的。
就这道题来说，我们假设发每单位的电，太阳能发电成本为100元，燃油发电实际成本需要65元，但国家为了发展太阳能，使它更具经济型，所以会使燃油发电成本提升超过太阳能发电，这里近似提升35元，那么这个提升的35元，就叫做“经济可行性阈值”。
如果太阳能发电成本降低，比如每单位电降低到90元，如果燃油发电成本不变，那么“经济可行性阈值”是要降低的（25元）
但是如果如C选项所说，燃油电厂的效率也提升了（成本降低），比如降低至每单位电55元，那么这时，经济可行性阈值是不变的，依然是35元，所以C选项正确。

第一题的的premise是outsourcing balabalabala，conclusion是boost profit
要想support的话 就要找出outsouring 和 profit 之间的关系
c选项 没有体现出boost profit的关系
E选项链接了outsourcing和boost profit 意思就是如果运用了outsourcing，就可以剥离那些低效率的业务，使经理把更多精力放在核心业务上，这样就可以使公司运营更好~（我想这个应该算是GMAT逻辑里默认的真理就是公司经营的好公司profit也多吧）

From Ron神：try to diagram the argument, numbering each of the sentences and using the 'THEREFORE TEST' (try 'x, therefore y' and 'y, therefore x', and see which, if either, of them makes sense).

1 Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage.
2 Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.
3 Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.
4 However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.

the structure of this argument is:
1 = background fact
2, therefore 3
however, 4 (which weakens conclusion 3)

if you figure out that much, then it's clear that #3 is the CONCLUSION. (that's the single most important thing you can do on critical reasoning: figure out what's the conclusion.)

since neither of the boldface portions is the conclusion, choice a and choice d are dead. (both of those claim that the second part is the conclusion.)

now, analyze the boldface parts a little better:
#2 (the first boldface) serves as a premise for #3
#4 (the second bold) serves as a counterpoint to #3, weakening the lasting value of the conclusion
...which is basically what choice c says.

choice b is tempting, but you should note that the argument is specifically designed to point out that this 'state of affairs' CAN affect the outcome. choice e is nonsensical, as the two boldfaces are on completely opposite sides of the proverbial fence.

我的错因:
1)这道题的“catfish to swim erratically”与"earthquake"本身就是correlation而不是"causal relation"。C选项确实undermine了——并非是“catfish to swim erratically”导致的earthquake，但是并不能否定correlation，反而是在揭示correlation的原理。
2)审题上，题干强调的是major/dangerous earthquake, 而E选项是slight tremors。

D ，which非限制性定语从句(整体概念)，表示所有bitter managerial conflicts都具有后述性质， 而激烈的管理冲突不可能只有这一种，不符合逻辑，不对； A 同位语that限制性从句，表明是bitter managerial conflicts中具有后述性质的那种conflicts，符合逻辑，正确

审选项错误。

D选项：定语从句which is more than all the North American Great Lakes combined应就近修饰，这里只能修饰20 percent of the world's fresh water，这是不正确的。该定语从句描述的在逻辑上应是Siberia's Lake Baikal的特点。

E选项：with more than 300 rivers draining into it是独立主格结构错误同选项(C)。

发现这种选人的都是用乘法，比如A组8人里选2个 B组3人里选2个，就是 C（8,2）* C*（3,2）