Which of the following headings is that of Paragraph Two? In nuclear fusion, two nuclei come together and ______.

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问题 Which of the following headings is that of Paragraph Two?
In nuclear fusion, two nuclei come together and ______.

选项 A、form a new nucleus
B、both split
C、give off free neutrons
D、reduce energy

答案A

解析 根据第四段第1句…,nuclear fusion,two nuclei come together,to form a new nucleus of a different kind…,可知正确答案应为A项。
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