It can be learned from the passage that about four billion years ago ______.
- A the earth was in molten state
- B the earth surface temperature was above 100℃
- C the earth surface temperature was below 100℃
- D rain water could remain on the earth
问题
It can be learned from the passage tha
参考解析：
43．答案为B。根据第一段最后一句及第二段内容可知，雨水在地表温度降到水的沸点以下才能停在地表，由此可知大约在四十亿年前，地表温度应在沸点以上。
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