2. 外语
  3. Modern scientists divide the process of dying into two stages-clinical or temporary death and biological death. Clinical death o

Modern scientists divide the process of dying into two stages-clinical or temporary death and biological death. Clinical death o

admin2012-08-10  47
问题     Modern scientists divide the process of dying into two stages-clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived (复活). Biological death occurs when changes in the organism lead to the disintegration (解体) of vital cells and tissues. Death is then irreversible and final.
    Scientists have been seeking a way to prolong 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(麻醉的) 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 monkey called Keta. The scientists put Keta to sleep with a narcotic. 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 its body. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped; clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into its body in the direction of the heart and started artificial breathing. After two minutes the monkey’s heart became active once more. After fifteen minutes, spontaneous breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.
This passage focuses on______.
选项 A、the difference between biological and clinical death
B、the process of dying
C、prolonging the period of clinical death
D、the nature of clinical death
答案C
解析 可定位在第2段第1句，文中指出：科学家一直在寻找一种方式来延长临床死亡的时间(a way to prolong the period of clinical death)，从而在生物死亡前使有机体复活(so that theorganism can be revived before biological death occurs)，继而用例子来证明这个观点，即科学家们用猴子Keta来做实验，并描述其过程及结论，选项C意为“延长临床死亡时间”，为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/T357777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)