考研英语难句1、The grand mediocrity of today——everyone being the sa

考研英语难句
1、The grand mediocrity of today——everyone being the same in survival and number of offspring——means that natural selection has lost 80% of its power in upper-middle-class India compared to the tribes.
这句话是意思我明白，只是破折号后面中的everyone being the same为不么不加is呢？这变成了everyone being is the same。
2、But in the past 100,000 years——even the past 100 years——our lives have been transformed but our bodies have not.
这句话破折号的后面是even the past 100 years为什么不是even in the past 100 years，介词也能省略吗？如果能请举出相关的例子。
csf4567 1年前他留下的回答 已收到1个回答

chankin 网友

该名网友总共回答了15个问题，此问答他的回答如下：采纳率：73.3%

楼主，这句that can jump our trains of thought onto new,innovative tracks不是非限定性定语从句，而是限定性定语从句，修饰parallel paths。
你可能被that前面的逗号误导了。and even entirely new brain cells是一个插入语，拿掉以后你再看，But brain researchers hav...

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