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一、熟读深思 反复朗读下列句子，仔细体会主语从句(画线部分)。
1. What it was to become was uncertain until between 4.5 and 3.8 billion years ago. 2. It was not clear whether the shape would last or not. 3. What is even more important is that as the earth cooled down， water began to appear on its surface.
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