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For almost forty years the Empire State Building in New York City was the world's tallest skyscraper（摩天大楼）. The building reaches a height of 1, 250 feet. It has 102 floors. The use of steel frames made its height possible. Steel walls can rise height without needing to be thick. Steel frame construction is strong. All plates are fixed firmly together by metal bolts（螺栓）called rivets （铆钉）. When set in place, rivets are usuall red- hot. One end is already rounded. A riveter uses a special hammer to shape the other end. Then the rivet cools. It holds the plates firmly. High winds can move this strong building. A wind of a hundred miles an hour has caused it to move almost one and a half inches.
The writer says that the Empire State Building ________.
A. hasn’t been finished
B. is in New York City
C. is the tallest skyscraper in the world now
D. had fewer floors than the New World Trade Center
In steel -frame building, the bottom walls________ .
A. must be very thick
B. must be rounded
C. are usually red - hot
D. do not need to be thick
Rivets are described as being ________.
A. picked up by tools when red -hot
B. hit by tools when red - hot
C. usually caught in a hole
D. usually put in place when red - hot
查看习题详情和答案>>Dangerous Sports
Around the world more and more people are taking part in danger ous sports and activities．Of course, there have always been people who have looked for adventure—those who have climbed unknown parts of the world or sailed in small boats across the greatest oceans．Now, however, there are people who seek an immediate thrill, a risky activity, which may only last a few minutes or even seconds．
I would consider bungee jumping to be a good example of such an activity．You jump from a high place（perhaps a bridge or a hot-air balloon） 200 meters above the ground with an elastic（有弹性的） rope tied to your feet．You fall at up to 150 kilometers an hour until the rope stops you from hitting the ground．It is said that about 2 million people around the world have now tried bungee jumping. Other activities which most people would say are as risky as bungee jumping include jumping from tall buildings and diving into the sea from the top of high cliffs.
Why do people take part in such activities as these? Some psychologists suggest that it is because life in modern societies has become safe and boring．Not very long ago, people’s lives were constantly in danger. They had to go out and hunt for food, diseases could not easily be cured, and there was a continuous battle for survival．
Nowadays, according to many people, life offers little excitement．They live and work in comparatively safe environments; they buy food in shops; there are doctors and hospitals to look after them if they become ill．The answer for some of these people is to look for danger in activities such as bungee jumping．
The best title for the text is .
A．Dangerous Sports: What and Why
B．The Boredom of Modern Life
C．Bungee Jumping: Is It Really Dangerous.
D．The Need for Excitement
More and more people today .
A．are tying activities such as bungee jumping
B．are climbing the highest mountains
C．are coming close to death in sports
D．are looking for adventures such as traveling into unknown places
The writer of the text has a attitude towards dangerous sports.
A．positive B．negative C．neutral（中立的） D．nervous
查看习题详情和答案>>Baekeland and Hartmann report that the “short sleepers” had been more or less average in their sleep needs until the men were in their teens. But at about age 15 or so, the men voluntarily began cutting down their nightly sleep time because of pressures from school, work, and other activities. These men tended to view their nightly periods of unconsciousness as bothersome interruptions in their daily routines.
In general, these “short sleeps” appeared ambitious, active, energetic, cheerful, conformist(不动摇) in their opinions, and very sure about their career choices. They often held several jobs at once, or workers full-or part-time while going to school. And many of them had a strong urge to appear “normal” or “acceptable” to their friends and associates.
When asked to recall their dreams, the “short sleepers” did poorly. More than this, they seemed to prefer not remembering. In similar fashion, their usual way of dealing with psychological problems was to deny that the problem existed, and then to keep busy in the hope that the trouble would go away.
The sleep patterns of the “short sleepers” were similar to, but less extreme than, sleep patterns shown by many mental patients categorized as manic(疯人).
The “long sleepers” were quite different indeed. Baekeland and Hartmann report that these young men had been lengthy sleeps since childhood. They seemed to enjoy their sleep, protected it, and were quite concerned when they were occasionally robbed of their desired 9 hours of nightly bed rest. They tended to recall their dreams much better than did the “short sleepers.”
Many of the “long sleepers” were shy, anxious, introverted (内向), inhibited (压抑), passive, mildly depressed, and unsure of themselves (particularly in social situations). Several openly states that sleep was an escape from their daily problems.
According to the report,______.
A. many short sleepers need less sleep by nature
B. many short sleepers are forced to reduce their nightly sleep time because they are busy
with their work
C. long sleepers sleep a longer period of time during the day
D. many long sleepers preserve their sleeping habit formed during their childhood
Many “short sleepers” are likely to hold the view that _____.
A. sleep is a withdrawal from the reality
B. sleep interferes with their sound judgment
C. sleep is the least expensive item on their routine program
D. sleep is the best way to deal with psychological troubles
It is stated in the third paragraph that short sleepers _____.
A. are ideally vigorous even under the pressures of life
B. often neglect the consequences of inadequate sleep
C. do not know how to relax properly
D. are more unlikely to run into mental problems
When sometimes they cannot enjoy adequate sleep, the long sleepers might ____.
A. appear disturbed B. become energetic
C. feel dissatisfied D. be extremely depressed
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