C选项是时态问题，客观事实用一般现在时，E中核心词是围绕这一动作 ，配合上时态就是至今为止发现了这个动作，有延续性，错误。
A中时态had\are正确，因为 by 1999过去的过去，谓语动词用过去完成时，客观事实用are，语义上是科学家发现了17个星星，that从句对星星进行描述，discover在表示持续的时态中是发现某个东西，如果在表示时间点的时候可以是发现一件事，比如发现星星围绕星球转

没有注意到主句有一个Nevertheless，以为是一个run-on

1. yet discovered至今为止发现的，一般接最高级
2. 注意同类比较的时候，A is more ADJ than any AA是错的，这里AA包含了A。必须要是A is more ADJ than any other AA. 同理，B选项中than what has yet been discovered包含了evidence
3. 比较的时候注意对象。B的一个很大的错误是拿evidence和被发现的东西来比较了，改变了原意
4. 时间状语修饰的位置，可能会改变句意要记得注意
5. more+adj+noun的结构一定会存在歧义，在选择的时候要注意衡量选项
------------kmf

太狡猾了

错选D,没有仔细看D后面的......
作者提出了一个alternative explanation，咋可能用evidence去反驳它

错在没搞清楚比较对象是谁。

注意：体会confirm和convince
confirm是证实了科学家们的推测
但是文章中说的是dispel了科学家们的doubts，也就是说驱散了他们的怀疑，使他们信服

those 是个代词，在平行结构中，不是所有的平行部分都用“that of ”来表达就是最对的，如果that or those找不到指代对象的话也是不能乱用的。

做题时 应该仔细分析下结构

The phrase “so that” suggests some sort of purpose, or at least expresses a rationale for accomplishing something. You could say “I eat burritos so that I will someday weigh as much as an aircraft carrier” or “Domenico posts regularly on GMAT Club so that other people can kick ass on this ridiculous exam.” In both cases, a purpose or effect follows the phrase “so that.”

2.'as' may mean simultaneity or even causality but not contrast. Contrast is an essential feature in this context. 'As' is an improper diction because the cool air mass is going to be ushered despite the dry weather for several days. One can safely keep off this choice.

a.1.Metaphorically, it is used about anything that brings something into existence. The basic idiom is: I usher X in.
If I want to specify the region in which this X is introduced, I would say:I usher X into A.
The "in . . . into" is redundant and wrong

短题考逻辑，长题看语法。。。没有考点的时候核心词就出来了

B和题目矛盾

the modifier "under provisions of the new maritime code" is placed in a location that is somewhat ambiguous -- it seems to suggest that the sea areas themselves are under those provisions.
(this is certainly not a fatal error, but you should notice it in contrast to the other answer choices, in which that modifier is moved to a more logically sound location).

(a) is redundant (provisions ... provide)

c：
COMMA + -ING modifiers must modify the preceding clause, but the -ING participle must also apply to the subject of the preceding clause.
therefore, the use of that comma+ing modifier would imply that the islets themselves are stimulating disputes. that's not true.

充分说明了修饰语要尽可能的放在他想要修饰的地方

if the Los Angeles metropolitan area is counted as a separate nation, 一定要用虚拟语气吗？

否定才能用so 二选一错了......