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    ________ garbage do you throw away each year?

    [　　]

    A．How many

    B．How much

    C．How often

    D．How soon
    答案：B
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    Whenever the scientist woke people during REM sleep, they were having vivid dreams. Measurements showed that sleepers’ pulses（脉搏）went up quickly during REM sleep. Their breathing, heartbeat, and the blood going to the brain also increased. Far from being a time of rest, REM sleep is a time when the body is hard at work. Scientists still don’t know the reason for this. Some believe REM sleep makes learning easier. Babies spend a lot of time in REM sleep. Because of this, some scientists believe that REM sleep helps the brain grow. Others think REM sleep is a time for the brain to empty the day’s garbage.
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    【小题2】Which word in paragraph（段落）3 means “colorful and lively”?
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    【小题3】Which paragraph tells what happens when people don’t get enough sleep?
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    【小题4】What is the main idea of the article?
    A．REM sleep helps the brain grow.
    B．REM sleep has been watched and recorded by scientists.
    C．REM sleep is a time to empty the day’s garbage.
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    B．can be avoided with lots of sleep
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    Do you know why you sleep? You may think it’s because you’re tired. Or perhaps you’ve been told sleep is good for you. Yet no one knows exactly why or how people sleep.
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