C: 1) 结论是no later than [1630], 欧洲贸易从1620开始活跃，所以不必然是the FIRST European goods; 2) 从argument看，题干的逻辑是①没发现EG+②1620后EG贸易活跃=>site在1620前，即使不考虑1)，C在削弱①，而D是 所有1620后的site=>都有发现EG#其实我觉得这个很牵强这个逆命题成立为什么strengthen正命题？.

同位语理解错误。

the passage goes from 【'the loss of some export markets'】to 【'annual exports of ... goods will ... diminish'】

that's a logical leap. in particular, the hidden assumption is that no other export markets will step up to take the place of the ones that will be lost. if we can find an answer choice that contradicts this assumption, we can weaken the argument.

For a package weighing 2 pounds or more, the company charges an initial fee of $6 plus $2 per pound. 该公司收取6美元的初始费用外加每磅2美元，没理解题意做错了

and连接的两个并列句，前后句子的主语要一致，排除ABD，C选项中to do不定式因为表示将来发生的动作，一般很少做主语，除非在to see is to believe这样的句子中。E选项中出现了being,一般也直接排除。最后需要注意的是，SC的解题步骤应该是：文法>句意>写法好坏的顺序来

设男生x人，女生y人
1）+2）33％x + 20％y = 25％（x + y）

8％x = 5％y

x /（x + y）= 5/13

这道题的考点是定语从句，A项的which是在辅助这个考点。
A项第二个which首先会有歧义修饰autobiography还是plays, novels,... as well as ...; 其次由于这里用的非限定性定从，删除非限定定从部分Hans Christian Andersen wrote fairy tales, while he wrote plays, novels, poems, and travel books, as well as several autobiographies。这句话意思又问题(while表示同时进行或对比。E选项没有非限定性定从的问题。

RON： if "with ____" is modifying xxxxx, then it should be describing some aspect, or sub-component, of xxxxx. here, "each" = each style of cooking. we can't use "with each style of cooking..." to describe "styles of cooking".

#each is a pron here. should find the phrase to which it refers#

B. 没有过去式做参照，had done不成立
C. 原句要表达的是这个paper won, 这里having won变成整句话的修饰；语义改变
D. 主句无谓语
E. 意思有问题，没有体现Katharine的特别作用

D选项，文章没有提到笔述者的惯用手法

CD解释：https://forum.chasedream.com/thread-451298-1-1.html

each other:相互 the others: 除了主语以外的那些人 one another:另外的某一个人 each better than the others，每个人比剩下的人好

ever before 要跟完成时

Use of 'each of which' is imprecise here. 'each of which' like 'which' requires a verb after that. As there is no verb after 'each of which', the construction is imprecise.

Correct use of 'each of which' -
select any two answer choices, each of which can be used to complete the sentence.
I have bought several books, each of which is based on a different theme.

along with india

* if you're going to use "while" with an adjective phrase (while willing to...), then that adjective phrase should precede the main verb.
i.e., many people, while willing to... , are disinclined to...

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。