What does the passage mainly discuss? [br] The word "it" in line 22 refers toA、a

游客2025-02-09 22

问题 What does the passage mainly discuss? [br] The word "it" in line 22 refers to

选项 A、a nutrient solution
B、a glass flask
C、boiling
D、spontaneous generation

答案 A

解析

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