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3. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. What is even more important is that as the earth cooled down, water began to appear on its surface. [考点] what引导的主语从句，第一句what 在从句中作become的宾语，第二句what在从句中作主语。
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