1. "five-nation" is actually an adjective. So, the five-nation Iroquois League is a singular noun phrase. We cannot say "one of/ alone of/ only of / the five-nation Iroquois League". i.e. these constructions seem like "one of apple/ alone of apple / only of apple". So, we can kill A, B and E.
2. in Choice D, "ones" groundlessly assumes that the Oneida consist of more than one nations and, in turn, changes the meaning.
此题需先弄清楚主句的谓语动词，从整个句子的逻辑意思可以看出整个句子的意思是“被...影响了，Oneida和colonists站在同一战线”。可见，位于动词是side with。由此排除A/B/D；而C和E选项，很容易便可分析出E选项是错误的选项。
A。who在修饰临近的五个，而不是only one
C：正确 the Oneida主语 （alone 相当于only强调唯一 among the five nations 复数正确 of the Iroquois League单数正确） sided谓语 with...
1.divide on和over都可以，不是考点
2.whether讨论的是是否会发生，没有预设已经发生了，不需要虚拟语气；what讨论的是如果发生了会有什么影响，预设已经发生，需要虚拟语气
3.what后面不能接疑问句式，'will it' is only ok in the context of a question ('will it rain tomorrow?'), and can't be used as a noun phrase.
(D)(E)while...，这是一个分句，后面必须有个主句，故排除
A、they denounce big government, while supporting specific government programs。 supporting 做伴随状语，表示伴随发生的情况，他们谴责大政府，尽管伴随着还支持特定的政府项目
d选项表达的意思是在美国几乎没有城市里河流时城市生活的关注点。而其他的选项里表达的意思是在美国绝大多数的城市里，河流不再！！！是生活的关注点。前者的表达了一种不变的状态，而后者表达了一种变化。
D没有语法错误，而是句意错误
E还原倒装后的真实句子：in the United States many cities no longer have a river as... but in San Antonio
I eat less of these foods than I did ten years ago.
"”> I eat these foods in smaller servings. This doesn't mean that I eat fewer of them (= that I've cut any of them out of my diet).
I eat fewer of these foods than I did ten years ago.
"”> Ten years ago, I ate N of these foods, where 0 < N ≤ 10.
Now I eat M of them, where M < N.
This statement implies nothing about serving size
1.such infections as后面跟的是infection的例子；而better control, if not eradication, of the other infections such as 后面跟的是better control的例子
2.such as和the other永远不能同时出现！such as表示举例，不是穷举。而the other表示除此之外的所有，是穷举
1. risk of doing sth., risk doing sth. 是固定搭配，由此排除A/D；
2. one chance in a million 是固定搭配，表示几率很小。由于修饰risk时，as little risk as one chance in a million 和 a risk as little as one chance in a million都是正确的表达方式。由此排除A；
3.D if the adjective is "many", "few", "much", or "little", then you cannot write "NOUN as adj. as..." Instead, you must write as many NOUNs as、as few NOUNs as、as much NOUN as、 as little NOUN as…
1.immute to... 不受...影响
immune from... 免除...
"immune from" means free of exempt from (eg. immune from prosecution), whereas "immune to" means not susceptible (eg. immune to chicken pox).
2.在we have now realized已经是现在完成，意味着在过去某个时间点之前我们都以为ozone是 immune from human influence，自然应该用过去完成时态。
3. it appeared后面加从句it blah blah是redundant，appear作为系动词，后面可以直接加形容词做表语。这样最为简洁清楚。
习惯用语-A as varied as B，A和B要平行，B用来解释、举例A
choice a, as varied as China, the Netherlands, and Hungary作为后置定语修饰countries，意思是诸如中国、荷兰、匈牙利等的国家
choice d, that are varied as China, the Netherlands, and Hungary 定语从句修饰countries, 意思是一定和中国、荷兰、匈牙利一模一样的那些国家
1. 句首since the start of the space age表示从过去开始持续到现在的时间，因而主句的谓语动词应使用现在完成时，由此排除C/E；
2. A：often because中Because是连词，后面需接完整的句子，而不是名词短语。because of + 名词短语。排除A；
3. C：除应使用现在完成时外，littered more and more应该是more and more littered。而often resulting from做状语，修饰前面整个句子，解释为什么会more and more littered，是正确的修饰。
4. D：littering of orbits near Earth中of应是in，表示在orbits near Earth中存在越来越多litter。此外，there be举行是“有...”的意思，违背了原句“orbit越来越脏”的逻辑意思，排除D；
5. E：E选项在时态、语法和逻辑意义上都存在很大问题，排除E；
6. B：正确选项，前半句好理解，而后半句是见得较少的，需学习此种用法。
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我觉E选项错误的原因是：它直接反驳了文章给出的信息“the average amount of overtime per month does not fluctuate much from MTH to MTH.”都说了不浮动了，E选项却说它有些月份加班有些月份不加？？？