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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