单选题：Researchers find it difficult to make algae produce hydrogen

题目分类：理工类
题目类型：单选题
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题目内容：

Researchers find it difficult to make algae produce hydrogen efficiently because __________. A．removing the sulfate slows down hydrogen production
B．it is hard to create an airfree environment
C．it is expensive to remove the sulfate from the environment
D．the algae's cells work slowly if there is no oxygen in the air

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