When did scientists come to realize how the atoms and molecules on the Earth mostlikely combined to make living things? At the

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问题 When did scientists come to realize how the atoms and molecules on the Earth mostlikely combined to make living things?
At the end of the last paragraph, the word "it" refers to ______.

选项 A、water
B、the liquid sample
C、a closed loop
D、an electric spark

答案C

解析
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