题目内容
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The infants kept kicking their legs for ______.
A．they were too young to control themselves
B．they wanted to attract others' attention
C．they were required to do so by the researchers
D．they might have found it enjoyable to control the mobile
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Some adults require little sleep; others need eight to ten hours in every twenty-four. Infants sleep sixteen to eighteen hours daily, the amount gradually going less as they grow older. Young students may need twelve hours; university students may need ten. A worker with a physically demanding job may also need ten, whereas an executive working under pressure may manage on six to eight. Many famous people are repute to have required little sleep. Napoleon Bonaparte, Thomas Edison, and Charles Darwin apparently averaged only four to six hours a night.
(77) Whatever your individual need, you can be sure that by the age of thirty you will have slept for a total of more than twelve years. By that age you will also have developed a sleep routine; a favorite hour, a favorite bed, a favorite posture (姿势), and a formula (程式) you need to follow in order to rest comfortably.
(78)Investigators have tried to find out how long a person can go without sleep. Several people have reached more than 115 hours nearly five days. Whatever the limit, it is absolute. Animals kept awake for from five to eight days have died of exhaustion. The limit for human beings is probably about a week.
The writer implies that ______.
A．sleep is important for good mental and physical health
B．a light sleep is as restful as a deep sleep
C．memory is improved during sleep
D．sleep is relatively unimportant for human beings
A. sleep is important for good mental andphysical health
B. a light sleep is as restful as a deepsleep
C. memory is improved during sleep
D. sleep is relatively unimportant for humanbeings
Some adults require little sleep; others need eight to ten hours in every twenty-four. Infants sleep sixteen to eighteen hours daily, the amount gradually going less as they grow older. Young students may need twelve hours; university students may need ten. A worker with a physically demanding job may also need ten, whereas an executive working under pressure may manage on six to eight. Many famous people are reputed to have required little sleep. Napoleon Bonaparte, Thomas Edison, and Charles Darwin apparently averaged only four to six hours a night.
(76) Whatever your individual need, you can be sure that by the age of thirty you will have slept for a total of more than twelve years. By that age you will also have developed a sleep routine: a favorite hour, a favorite bed, a favorite posture (姿势), and a formula (程式) you need to follow in order to rest comfortably.
(77) Investigators have tried to find out how long a person can go without sleep. Several people have reached more than 115 hours---nearly five days. Whatever the limit, it is absolute. Animals kept awake for from five to eight days have died of exhaustion. The limit for human beings is probably about a week.
The writer implies that ______ .
A．sleep is important for good mental and physical health
B．a light sleep is as restful as a deep sleep
C．memory is improved during sleep
D．sleep is relatively unimportant for human beings
(2) There are others who are deliberately late, to make a dramatic entrance or to show an imagined superiority. In Hollywood, it's been said, everyone important is usually late for everything but studio conferences. At a party, each star arrives late—in order of status. The top box-office attraction is allotted the final arrival.
A psychiatrist tells me that sometimes tardiness is a form. of subconscious sulking, an attempt to get even with another person. It is also a sign of immaturity. (3) People who are habitually late are in a sense still infants to whom time and the other person's convenience mean nothing.
Some unfortunates will always be incapable of being punctual. (4) A movie star noted for continually being late was invited to christen a destroyer, and pointedly informed that the Navy does things on time. She arrived promptly, then kept the admiral and his staff waiting while she spent almost an hour in the powder room. Subsequently she decided to undergo psychiatric treatment to correct her habitual lateness. But she had to give up the sessions. She was always too late for her appointments with the psychiatrist.
(5) Fortunately, being punctual, like being late, is also a habit—easy to cultivate once you have decided what has made you so careless of time in the past. It is a most rewarding habit: after you have attained it you will find how greatly it simplifies living.
A.KI ＜ KIC 有裂纹，但不会扩展（破损安全）
B.KI ＜ KIC 临界状态
C.KI=KIC 发生裂纹扩展，直至断裂
D.KI＞KIC 有裂纹，但不会扩展（破损安全）
σb表示______；δ表示______；φ表示______；HRC表示______；HBS表示______；αk表示______；K1表示______；KIC表示______。
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