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  3. Which of the following would be the most appropriate title for the passage? It can be inferred from the passage that the gases

Which of the following would be the most appropriate title for the passage? It can be inferred from the passage that the gases

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问题 Which of the following would be the most appropriate title for the passage?
It can be inferred from the passage that the gases of the Earth’s atmosphere are contained by ______.
选项 A、a closed surface
B、the gravity of the planet
C、the field of space
D、its critical point
答案B
解析 依据文章第四句话：因为气体将扩散到有可能到达的整个空间，所以必须存于一个封闭的容器内，至于地球上的大气，则是由于重力场的作用而使其不致外散。
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