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 D

解析 By the end of100 million years，plants had developed their roots(到了1亿年前的后牛段，植物已经形成了它们的根)从以上这句话可以看出，本题的正确答案应该是D.

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