What is the main idea of the passage? Which of the following does the passage mention as necessary for both the production of o

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问题 What is the main idea of the passage?
Which of the following does the passage mention as necessary for both the production of oxygen by photodissociation and the production of oxygen by plants?

选项 A、Water
B、Hydrogen
C、Carbon dioxide
D、Nitrogen

答案A

解析

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托福（TOEFL）

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Completethesentencesbelow.ChooseONEWORDONLYfromthepassageforeachanswer.Correspondencewasheldovera______prior

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