The main idea of the first paragraph is ______. Plants with roots appeared about ______.million years ago.

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问题 The main idea of the first paragraph is ______.
Plants with roots appeared about ______.million years ago.

选项 A、430
B、300
C、330
D、100

答案C

解析 最先出现的植物在4亿3千万年前,1亿年后,植物开始生根,也就是3亿3千万年前。
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