The main idea of the first paragraph is ______. [br] Plants with roots appeared

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问题 The main idea of the first paragraph is ______. [br] 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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Themainideaofthefirstparagraphis______.[br]Plantswithrootsappeared