Discuss in groups of four and finish the experiment report.

小组讨论并完成实验报告。

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The experiment was divided into five groups, four experimental groups and a control group.

实验分五组，即四个实验组和一个对照组。

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The experiment was divided into five groups, four experimental groups and a control group.

实验分五组，即四个实验组和一个对照组。

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