Three possible theories of what a sea-dwelling microorganism’s eye might be for.

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Directions: You have 20 minutes to plan and write your response. Your response will be judged on the basis of the quality of your writing and on how well your response presents the points in the lecture and their relationship to the reading passage. Typically, an effective response will be 150 to 225 words.

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听力材料：

1：Other closely-related microorganisms which have no eyes could follow their prey successfully. Therefore, their eyes must be for other purposes.
2：Scientists studying the evolution of microorganism find that they are becoming less and less dependent on sunlight for energy. Compared with their ancestors, the sea-dwelling microorganism is with a much more complex eye. So it must have other functions.
3：After examining the eye thoroughly, researchers find that its eye couldn’t f

阅读材料：

1：The eye is used for following preys.
2：The eye is used for sensing sunlight.
3：The eye is used for aiming at having a better accuracy at other tiny life-forms when it is going to stab them.

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Three possible theories of what a sea-dwelling microorganism’s eye might be for.

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