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All the students live on floor.

A. three B. third

C. the third D. the three

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Here is a surprising and important fact: Mental work(脑力劳动) alone can’t make us tired. It sounds absurd(荒谬的). But a year ago, scientists tried to find out how long the human brain could work without reaching a stage of fatigue (疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer(工人), we would find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

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