原文：种在20年间有者best record的树；题目要求：undermine the claim(tree planting-->abundant tree population)
B选项，在20年前存在的树被砍了，无关
C选项：树到达了年龄生长极限，无关，也不能说明claim
E选项：只种单一数目的树，可能会使得树由于某种疾病而大量死亡，因此不会有abundant tree population，可选
B:In rural areas of the state, there are relatively few retail establishments and government offices that are open to the public.
即使很少，但还是可以起到extension的效果，不选
C:The state law would supersede the local antismoking ordinances, which contain stronger bans than the state law does.
直接说明了变成洲际之后，反而不如当地法，因此达不到extension效果，可选
Like = used to compare two nouns; the word after “like” should be a noun
As = used to compare two actions or verbs; the work after “as” can be either a noun or verb
(Note: ”like” and “similar to” are the same thing, and follow the same rules)
弄清楚比较主体
是句子VS句子的比较
doing sth is a goal of sb, as it was of sb
【引用】
-这里是不同时代的比较,基本结构是doing something is a goal of sb,as it was (a goal)of sb.
-Like是接名詞,as要接子句.使用Like只能进行主语比较。 如果主句的主语是个名词，可以用like + n；如果主句主语是个doing ... ，就不要用like了，因为不能平行，要用as 引导句子；
2.it指代的是前后是同一个东西，that指代的是同一类，但前后东西不一样.
这里面owing and living in a house这个dream是不同代人的同一个梦想，因此用it,而不是that!
C: as+句子正确，但是用did替换is a goal前面不平行一致
Because the source of a hot spot remains fixed while a surface plate moves over it, 【over a long period of time】 an active plume creates a chain of volcanoes or volcanic islands,
AE未提及；C选项指的是大多数火山爆发的情况；D选项提到了many other chains，实际原文只说到了a chain，错误；
Because of its proximity to Earth's core, 核心词mantle-->reservoir-->plume-->hot spot
The surface mark of an established plume is a hot spot E选项正确
A选项提及untapped，未开发的plume，定位句[The "mantle plume" thus formed, once established, continues to channel hot material from the mantle base until the reservoir is emptied. ]错误
BC指的都是大多数火山爆发的情况，并非考察文段中少数火山爆发的情况；
D选项全文未提到，排除
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P：富人不再被允许减免；C：许多机构会因此减少服务，或关停
只有A选项明确说到富人不再捐原来这么多钱，直接弥补了原文P&C之间的gap，且取非能削弱结论；
但B/D选项分别提到了捐赠的钱是机构唯一的收入来源/富人是这些机构唯一的捐赠者，都没有【明确】说到是否减少捐赠的钱，取非不一定削弱结论，排除