The Death

Modern scientistsdivide the process of dying into two stages一(46)________.Clinical death occurs when the vitalorgans,such as the heart or lungs,have ceased to

function,but havenot suffered permanent damage. The organism can still be revived（复活）.Biological death occurs whenchanges in the organism lead to the

disintegration（解体）of vital cells and tissues. Deathis then irreversible and final.

Scientists have beenseeking a way to prolong the period of clinical death so that(47) ________.Thebest method developed so far involves cooling of the organism,combined

with narcotic（麻醉的）sleep. By slowing down the body'smetabolism（新陈代谢）,cooling delays the processes leadingto biological death.

To illustrate howthis works,scientists performed an experiment on a six-year-old female monkeycalled Keta.(48)_________.Then they surrounded her body with ice-bags

and began checkingher body temperature.When it had dropped to 28 degrees the scientists begandraining blood from its body.The monkey's blood pressure decreased and an

hour later both theheart and breathing stopped,clinical death set in.For twenty minutes Ketaremained in this state.Her temperature dropped to 22 degrees.At this point the

scientists pumpedblood into its body in the direction of the heart and started artificialbreathing.(49)_______.After fifteen minutes,spontaneous breathing began,andafter

four hours Ketaopened her eyes and lifted her head.After six hours,when the scientists triedto give her a penicillin injection,Keta seized the syringe and ran with itaround

theroom.(50)__________.________（47）

A.the organism canbe revived before biological death occurs

B.clinical ortemporary death and biological death

C.After two minutesthe monkey's heart became active once more

D.Her behaviordiffered little from that of a healthy animal

E.The scientists putKeta to sleep with a narcotic