Sleeping too little or for too long ages the brain by up to seven years. Get

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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. [br] 【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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