Good sleep is important for our health and well-being. Most of us need between seven and nine hours of sleep every night to stay healthy. However， many people do not get enough sleep because of their busy lives.
The body repairs and strengthens itself during sleep. If you do not get enough sleep， your body will not be able to repair and become stronger. For example， after just one night of poor sleep， your immune system will be weaker.
Sleep also plays an important role in keeping our brains healthy. During sleep， the brain processes and stores information. If you do not get enough sleep， you will have difficulty concentrating and remembering things.
Finally， getting enough sleep is important for our mental health. Lack of sleep can lead to feelings of stress， anxiety， and depression.
1.How many hours of sleep do most people need every night?
A. Five hours.
B. Six hours.
C. Seven to nine hours.
D. Ten hours.
2.If you do not get enough sleep， what will happen to your body?
A. It will become stronger.
B. It will be repaired and become stronger.
C. It will be weaker and more prone to disease.
D. It will be unable to repair itself.
3.What does the brain do during sleep?
A. It processes and stores information.
B. It dreams and processes information.
C. It processes and dreams.
D. It stores information only.
4.What is the importance of sleep?
A. It helps us stay healthy and happy.
B. It helps us stay alive and well-balanced.
C. It helps us stay focused and concentrated.
D. It helps us stay physically healthy and emotionally well-balanced.
5.What is the main idea of the passage?
A. To tell us how much sleep we need every night to stay healthy.
B. To tell us why we need to get enough sleep every night to stay healthy and happy.
C. To tell us why we need to get enough sleep every night to stay focused and concentrated.
D. To tell us why we need to get enough sleep every night to stay physically healthy and emotionally well-balanced.
参考答案：
1.答案：C. Seven to nine hours.
原文中提到“Most of us need between seven and nine hours of sleep every night to stay healthy.”大多数人每晚需要7到9个小时的睡眠来保持健康。因此，正确答案是C。
2.答案：C. It will be weaker and more prone to disease.
原文中提到“If you do not get enough sleep， your body will not be able to repair and become stronger.”如果你没有得到足够的睡眠，你的身体将无法修复和变得更加强壮。因此，选项C“身体会变得更弱，更容易患病”是正确的。
3.答案：A. It processes and stores information.
原文中提到“During sleep，the brain processes and stores information.”在睡眠期间，大脑会处理和储存信息。因此，正确答案是A。大脑在睡眠期间会处理和储存信息。
4.答案：D. It helps us stay physically healthy and emotionally well-balanced.
原文中提到“Finally，getting enough sleep is important for our mental health.”最后，获得足够的睡眠对我们的精神健康非常重要。因此，正确答案是D。睡眠有助于我们保持身体健康和情绪平衡。
5.答案：B To tell us why we need to get enough sleep every night to stay healthy and happy.
文章主要讲述了睡眠对我们身体和心理健康的重要性。文章提到，充足的睡眠有助于我们的身体修复和强化，大脑健康以及精神健康。因此，我们需要每晚获得足够的睡眠来保持健康和快乐。选项B正确地总结了文章的主要观点。
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