Which of the following headings is that of Paragraph Two? The aim of a nuclear reactor is ______.

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问题 Which of the following headings is that of Paragraph Two?
The aim of a nuclear reactor is ______.

选项 A、to establish a controlled chain reaction in low concentrations of fissile material
B、to absorb neutrons travelling at a particular speed
C、to cause a rapid chain reaction in order to release the greatest amount of energy
D、to last the chain reaction forever

答案A

解析根据文章第二段，核反应除了能在原子弹内进行外，还可以在一种叫核反应堆的建筑里进行。在核反应堆里有一些不易裂变的原料，例如石墨，通过使这种不易裂变的原料与那些易裂变的原料接触去控制核反应的进行。

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考研英语一

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