What does the passage mainly discuss? It can be inferred from paragraph 3 that Pasteur employed a swam-necked flask to

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问题 What does the passage mainly discuss?
It can be inferred from paragraph 3 that Pasteur employed a swam-necked flask to

选项 A、store sterilized liquids for use in future experiments
B、prevent heat from building up in a solution
C、disprove a criticism of his conclusions
D、estimate the number of organisms in a liter of air

答案C

解析
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