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英语单选题From then on____man began looking for ways to go into__

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英语单选题
From then on____man began looking for ways to go into___space.

为什么两个空格都不填?为什么不能填the呢?
Per capita income in the North Korea is about 5 percent of ___in the South Korea.
A.that    B.one  C.the one   D.it  为什么选A?
___with any common sense can tell the difference between the two easily.
A.who     B.whoever     C.anyone  D.who ever  为什么选C?

英语单选题From then on____man began looking for ways to go into__
From then on____man began looking for ways to go into___space.
在这里man是类指,指的是人类,是个集体概念,所以不能加定冠词the特指,也不能加不定冠词a /an指代某个,space在这里太空,go to space ,去太空,中间没有冠词的.
Per capita income in the North Korea is about 5 percent of ___in the South Korea.
A.that B.one C.the one D.it
that代指的是前面的Per capita income,人均收入,其他不能这么代指,只有that有这种用法,可以指代前面一样的内容,避免重复.
___with any common sense can tell the difference between the two easily.
A.who B.whoever C.anyone D.who ever
anyone是要做主语的,主句是anyone can tell the difference.with any common sense只是用来修饰主语的,其他三个都只能是从句中的,不能做主语