正确答案: A

败血症

题目：烧伤病人最重要的死亡原因是 （ ）

解析：A

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举一反三的答案和解析：

[单选题]It can be learned from the passage that about four billion years ago ______.

the earth surface temperature was above 100℃

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。

[单选题]原生植物群落的复生的条件是（ ）

土壤和种子来源

[单选题]Passage Four"Cool" is a word with many meanings. Its old meaning is used to express a temperature that is a little bit cold. As the world has changed, the word has had many different meanings.

many different meanings

解析：

46．答案为D  从短文第一段As the world has changed，the word has had many different meanings可知cool有很多不同的意思，D为正确选项。