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  3. Sleeping too little or for too long ages the brain by up to seven years. Getting less or more than the six to eight hours can ca

Sleeping too little or for too long ages the brain by up to seven years. Getting less or more than the six to eight hours can ca

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问题     Sleeping too little or for too long ages the brain by up to seven years. Getting less or more than the six to eight hours can cause health【C1】______and ultimately lead to an early death.
    Seven hours will keep the brain in【C2】______condition, said scientists at the University of London Medical School, who said a(n) 【C3】______of sleep affects reasoning and vocabulary. They found "the magnitude(大小)of the effect is【C4】______to four to seven years of ageing".
    Researchers said changes over a five-year period in late middle-age affect the function of the brain. Between 7 and 8 per cent of those who slept longer than the【C5】______amount fared worse in cognitive tests. But a quarter of women and one in six men who【C6】______to get a night’s good sleep suffered a(n) 【C7】______in reasoning, vocabulary and cognitive tests.
    The negative effects of too much,【C8】______and poor quality sleep on various aspects of【C9】______and physical health have begun to receive more attention. "【C10】______that society increasingly affects our lives, it is important to consider what effects changes in sleep duration may【C11】______on health and how long we live."
    Researchers found the【C12】______amount of sleep duration of seven hours per night【C13】______the highest score for every test.【C14】______proper amount of sleep, people will be【C15】______of working and studying more efficiently.【C16】______people will become less productive. At the same time their ability to【C17】______is affected and the memory is not as【C18】______. They may find themselves less patient and【C19】______. All of these consequences will【C20】______affect their social interaction and decision-making ability.
【C12】
选项 A、dominant
B、ideal
C、precise
D、slight
答案B
解析 考查形容词辨析。dominant“支配的，主要的”；ideal“理想的”；precise“精确的”；slight“细微的”。文中第2段提出7小时为合适的睡眠时间，而且空格后也提到the highest，score，推断这里应填ideal“理想的”，故选B。
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