Why was the origin of life a sample step in the Earth's history?

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WhywastheoriginoflifeasamplestepintheEarth''shistory?WhywastheoriginoflifeasamplestepintheEarth''shist

Why was the origin of life a sample step in the Earth's history?
Why was the origin of life a sample step in the Earth's history?

Why was the origin of life a sample step in the Earth's history?
Why 疑问副词作状语
was 谓语
the origin of life主语
a sample step 表语
in the Earth's history 状语
把句子换成陈述句,成分会更加明了:
The origin of life was a sample step in the Earth's history

Why was the origin of life a sample step in the Earth's history?
为什么原始生活在地球历史上是一种简单生活方式。
这是一个疑问句结构,加了个why+疑问词
正常的陈述语句应该是The origin of life was a sample step in the Earth's history.
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Why was the origin of life a sample step in the Earth's history?
为什么原始生活在地球历史上是一种简单生活方式。
这是一个疑问句结构,加了个why+疑问词
正常的陈述语句应该是The origin of life was a sample step in the Earth's history.
原始生活在地球历史上是一种简单的生活方式。

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不知道 你去百度文库那里去看看

为什么生命的源头是地球历史的样品?