2. 外语
  3. The main idea of the first paragraph is ______. Which of the following is tree?

The main idea of the first paragraph is ______. Which of the following is tree?

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问题 The main idea of the first paragraph is ______.
Which of the following is tree?
选项 A、Algae has existed for more than 430 million years.
B、It is impossible that algae might be the earliest plant on land.
C、Plants get food from animals in the oceans.
D、Evolution began after animals appeared on land.
答案A
解析 参见第一段。
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