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

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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