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How Long Can a Human Survive Without Water and Food? People do not need food as much as they do water. In fact, they can sur
How Long Can a Human Survive Without Water and Food? People do not need food as much as they do water. In fact, they can sur
admin
2013-09-17
55
问题
How Long Can a Human Survive Without Water and Food?
People do not need food as much as they do water. In fact, they can survive quite a long time without it depending on many factors. 【T1】______Indian leader Gandhi once fasted(禁食; 戒斋)for three weeks. According to medical experts people can survive without food for up to two months, as long as they have enough to drink. If you are strong and in good physical shape you are likely to survive longer, because the body stores fat, carbohydrates and other forms of energy. 【T2】______
Surviving without food also depends on how fast a person burns food. Those who use up food energy faster will probably not survive as long as those who burn food more slowly. Climate also plays an important role in survival. 【T3】______A hot climate allows you to go on longer without replacing food.
Eating too little for a long time causes your body to react in some special ways. 【T4】______After many weeks without food your body organs can fail one after the other.
【T5】______We constantly lose water through sweat, urine, breathing and other activities. If it is very hot your body can dehydrate within a matter of hours. The water and minerals the body loses must be replaced so that our organs can work as they should. Water helps us cool down in the heat; otherwise we would suffer from a heat stroke. Doctors also tell us to drink a lot when we are ill and have fever.
Dehydration can lead to many illnesses, from too little urine to a dry mouth, a fast heartbeat or even vomiting. Shock comes at the end of dehydration. The body becomes cool and blood pressure goes down rapidly.
Doctors recommend drinking one to three liters of water a day, depending on the climate and how much you sweat or exercise. You should never go on without water for a day or more.
A. Living without water is a very different story.
B. Water is primary condition of the human survival and lifeline of the national economy.
C. Cold weather makes you use up more energy.
D. It may lead to physical weakness or confusion.
E. History has shown that people can go on for weeks without eating anything.
F. That is why fatter people can survive longer.
【T3】
选项
答案
C
解析
根据空格所处段落的主题句“Surviving without food also depends on how fast a personburns food.(没有食物生存也取决于一个人的身体消化食物的速度)”;以及空格后“A hotclimate allows you to go on longer without replacing food.(炎热的气候允许在没有食物的支持下坚持更久)”,两者联系,选项C最符合逻辑。
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