2. 职称英语
  3. Modern scientists divide the process of dying into two phases—clinical or te

Modern scientists divide the process of dying into two phases—clinical or te

游客2025-03-21  28
问题     Modern scientists divide the process of dying into two phases—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. Biological death occurs when changes in the organism lead to the disintegration 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 reanimated before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic (麻醉的,催眠的) sleep. By slowing down the body’s metabolism, cooling delays the processes leading to biological death.
    To illustrate how this works, scientists performed and experimented on a six-year-old female baboon (狒狒) 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 an artery. The monkey’s blood pressure decreased and an hour later both the heart and respiration 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 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, spontaneous respiration 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 (注射器) and ran with it around the room. Her behavior differed little from that of a healthy animal. [br] One characteristic of clinical death is______.
选项 A、lasting damage to the lungs
B、destruction of the tissues
C、temporary non-functioning of the heart
D、that the organism cannot be reanimated
答案 C
解析 这是一道细节题。文中第一段第二句说：“当关键的机体组织，如心脏或肺，已经停止了功能，但还未遭到永久损害时，临床死亡就发生了。”C符合文中内容，即心脏暂时不起作用了。A“肺部的持续损害”与文中内容正好相反，应排除。B“生物组织的破坏”和D“生物体不能复活”，与文中内容不符，也应排除。
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