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Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．By filtering sea water.
B．By treating sea water with chemicals.
C．By taking salt out of sea water.
D．By drying up sea water.

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When millions of rods in our eyes are at work in darkness, we can see ______.

单项选择题

Passage OneQuestions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。