Scientists have been seeking a way to delay the period of clinical death so that the organism can be revived before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body's metabolism(新陈代谢), cooling delays the processes leading to biological death.

　　 To illustrate how this works, scientists performed an experiment on a six-year-old female baboon called Keota. The scientists put Keotato sleep with a narcotic (催眠的). Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery(动脉). The monkeys' blood pressure decreased and an hour later both the heart and respiration(呼吸) stopped --- clinical death set in (插入). For twenty minutes Keota remained in this state. Her temperature dropped to 22 degrees. At this point, scientists pumped blood into an artery in the direction of the heart and started artificial respiration. After two minutes, the baboon's heart became active once more after fifteen minutes, respiration began, and after four hours Keota opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection(注射), Keota seized the syringe(注射器)and ran with it around the room. Her behavior differed little from that of a healthy animal. 

1. This passage focuses on _______.

A. the difference between biological and clinical death 

B. the nature of clinical death

C. the process of dying　　　　    　　　　　　   

D. prolonging the period of clinical death

2. One characteristic of clinical death is ______.

A. lasting damage to the lungs or the heart   B. damage of the tissues

C. temporary non-functioning of the heart   D. damage of important cells

3. According to the passage, cooling an organism ______.

A. speeds up the body's metabolism　　    B. prevents biological death

C. makes damaged organs come to life   D. does none of the above

4. Which of the following is not mentioned in the passage?

A. The process of dying is divided into clinical and biological death.

B. Cooling might cause the damage of important cells and tissues.

C. An experiment on a baboon showed that an organism can be saved before biological death occurs.

D. After the experiment, Keota behaved almost the same as the other monkeys.

5. One possible benefit of the experiment discussed in the passage is ______.

A. Fewer deaths from heart attacks　　  B. protection against deadly injury

C. Victory over death　　　　　　　　 D. less crowded cities

Modern scientists divide the process of dying into two stages --- clinical(临床的)or temporary(暂时的)death and biological death. Clinical death occurs when the most important organs, such as the heart or lungs, have ceased(停止)to function, but have not suffered permanent(永久的) damage. The organism(生物体)can still be brought back. Biological death occurs when changes in the organism lead to the breakup of most important cells and tissues(组织) Death is then irreversible(不能撤回的)and final.

　　 Scientists have been seeking a way to delay the period of clinical death so that the organism can be revived before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body's metabolism(新陈代谢), cooling delays the processes leading to biological death.

　　 To illustrate how this works, scientists performed an experiment on a six-year-old female baboon called Keota. The scientists put Keotato sleep with a narcotic (催眠的). Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery(动脉). The monkeys' blood pressure decreased and an hour later both the heart and respiration(呼吸) stopped --- clinical death set in (插入). For twenty minutes Keota remained in this state. Her temperature dropped to 22 degrees. At this point, scientists pumped blood into an artery in the direction of the heart and started artificial respiration. After two minutes, the baboon's heart became active once more after fifteen minutes, respiration began, and after four hours Keota opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection(注射), Keota seized the syringe(注射器)and ran with it around the room. Her behavior differed little from that of a healthy animal. 

1. This passage focuses on _______.

A. the difference between biological and clinical death 

B. the nature of clinical death

C. the process of dying　　　　    　　　　　　   

D. prolonging the period of clinical death

2. One characteristic of clinical death is ______.

A. lasting damage to the lungs or the heart   B. damage of the tissues

C. temporary non-functioning of the heart   D. damage of important cells

3. According to the passage, cooling an organism ______.

A. speeds up the body's metabolism　　    B. prevents biological death

C. makes damaged organs come to life   D. does none of the above

4. Which of the following is not mentioned in the passage?

A. The process of dying is divided into clinical and biological death.

B. Cooling might cause the damage of important cells and tissues.

C. An experiment on a baboon showed that an organism can be saved before biological death occurs.

D. After the experiment, Keota behaved almost the same as the other monkeys.

5. One possible benefit of the experiment discussed in the passage is ______.

A. Fewer deaths from heart attacks　　  B. protection against deadly injury

C. Victory over death　　　　　　　　 D. less crowded cities