1. (2022八上·昆明期中) 根据短文内容，判断句子正误

Of all the things we eat and drink, water is the most important. Not many people know this, but it is true. The human body can go without food for a long time, but two or three days without water usually make people die.

Many people don't know how much water the human body needs and they don't drink enough, especailly in hot weather. Most people drink when they feel thirsty. They often need more water especially when they have sports.

A man's body is 65 to 70 percent water. If we don't have enough water, we may feel tired and may become ill.

1. （1） Many people know that water is the most important thing for human body.
3. （2） The human body can go without water for more than three days.
5. （3） Everyone knows that how much water the human needs.
7. （4） Most people drink water when they feel thirsty.
9. （5） If we don't have enough water, we may be ill.