as well 通常放在一个句子末尾

pay close attention we have "and", which triggers parallelism. In the 1st noun underlined Part we have Can threaten so we need a parallel verb to that, based on that Option A,B,C gets eliminated

地中海是确定的，那些石碑就在地中海边上，没法假想。只能假想前辈们。

idiom：try to do not try for doing
recover out of 不好
C：trying 这件事很worthwhile？

"this process" = "trying to recover uranium out of seawater"
However, "trying to ..." cannot be said to be expensive. We can say "to recover ..." is an expensive process, but we cannot say "trying to recover ..." is an expensive process. So (C) is illogical.

A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误

C. as 引导的状语从句缺少主语，C错误。并且，“发展”这个行为在繁荣不对

so as to = so that 注意看

unable to be 经济转移没能力 被.... 逻辑不通

定位：By the time Europeans sailing the Atlantic coast of North America first documented the fur trade, it was apparently well underway. The first to record such trade—the captain of a Portuguese vessel sailing from Newfoundland in 1501
在最早的记载皮草交易的时候，这个交易明显已经开始了，最早的交易记录是1501年，所以选B，没有关于1501年之前的记录

unlike any other ... 只能和其他的比 不能和自己比
非谓语修饰最近从句的主语
语义是 这个生物spend 不是其他昆虫

such that sothat 是否存在因果 存在才可以使用

duringwhich it it多余

语义 分析技术导致不情愿？ 应该是人不情愿

不定时和从句
不定式和名词的区别
谓语动词和后面的动作是否有直接影响 是否有强约束力

每一个和其他人比 each the others

语义 是 contraction 产生热
语法 主谓一致

句意 是music 而不是collection； 转换 复制 调整是并列关系

it 指代？ 多余？
同位语从句

each 引导的独立主格 语义是colony 族群不是animals

and 前后的并列关系

关注复数名词和单数名词的匹配