Don’t ________any detail in your account even if a word.
A. let out B. take care
C. make sure D. make out
句子翻译
1.当SARS爆发时，突然的恐惧迅速地弥漫全国。(break out)
2.只要更努力，你终久会成功。(in time)
3.他们尽力使那些遭遇地震不幸的人们高兴起来。(cheer up)
4.我们应该想办法防止有害气体的蔓延。(prevent… from)
5.她发现河面上有奇怪的东西浮着，这使她感到非常害怕。(float)
6.运动员没有听从教练员的指令，结果使他打赢比赛的计划落空。(disappoint)
7.随后它会变成什么曾经是一个迷，直到最后这团尘埃开始慢慢地合成一个环绕太阳运转的球状物。(combine into)
8.在未来的千百万年中，生命能否在地球上延续将取决于这个问题能否得到解决。
9.有些奇怪的动物会生蛋，但又给它的幼崽喂奶。(lay eggs)
10.当对他们有害的动物消失时，哺乳动物便快速繁殖。(multiply)
单句改错
1.Measures should be taken to stop the river from being polluting.
2.The gardener explained us the development of a seed into a plant.
3.The audience exploded laughter while listening to the cross talk.
4.The strength of the explosion broke all the windows in the building.
5.A violence storm struck our town and caused serious damage yesterday.
6.The bird was lucky enough to escape from fired.
7.Having learnt the text, we know many more about gravity.
8.Some animals produce their young from their bodies.
9.He seems that he has worked in sales for several years.
10.Languages have developed for a long period of time.
Unless we spend money to spot and prevent asteroids(小行星) now, one might crash into Earth and destroy life as we know it , say some scientists.
Asteroids are bigger versions of the meteoroids(流星) that race across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands of asteroids whose orbits put them on a collision course with Earth.
Buy $50 million worth of new telescopes right now. Then spend $10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we’ll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn’t be cheap.
Is it worth it? Two things experts consider when judging any risk are: 1) How likely the event is; 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare—but if one did fall, it would be the end of the world. “If we don’t take care of these big asteroids, they’ll take care of us,” says one scientist. “It’s that simple.”
The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? “The world has less to fear from doomsday(毁灭性的) rocks than from a great nuclear fleet set against them,” said a New York Times article.
1.What does the passage say about asteroids and meteoroids?
A. They are heavenly bodies different in composition.
B. They are heavenly bodies similar in nature.
C. These are more asteroids than meteoroids.
D. Asteroids are more mysterious than meteoroids.
2.What do scientists say about the collision of an asteroid with Earth?
A. It is unlikely but the danger exists.
B. Such a collision might occur once every 25 years.
C. Collision of smaller asteroids with Earth occur more often than expected.
D. It’s still too early to say whether such a collision might occur.
3.What do people think of the suggestion of using nuclear weapons to alter the course of asteroids?
A. It sounds practical but it may not solve the problem.
B. It may create more problems than it might solve.
C. It is a waste of money because a collision of asteroids with Earth is very unlikely.
D. Further research should be done before it is proved applicable.
4.We can conclude from the passage that ________.
A. while pushing asteroids off course nuclear weapons would destroy the world
B. asteroids racing across the night sky are likely to hit Earth in the near future
C. the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime
D. workable solutions still have to be found to prevent a collision of asteroids with Earth
The journey to the moon had been the first step toward future exploration(探险) in space. The distance between the Moon and Earth is very short indeed when compared with the distances between Earth and the other planets. Mars, the nearest planet to Earth is millions of miles away. Traveling to the planets will be man’s next aim. Such travels will be more challenging than the trip to the moon and certainly more adventurous.
Recently, two American spaceships, Vikings 1 and 2, landed on Mars trying to discover whether that planet has any life on it. So far the signs of life on Mars has neither confirmed(确认) nor ruled out. Russians have discovered that the surface of Venus(金星) is so hot that it is almost certain that there is no life there. Also the atmosphere of Venus is extremely dense(稠) and the pressure is nearly a hundred times greater than that of the Earth’s atmosphere.
Scientists believe man may find planets which have the same conditions as those we have on Earth, but man should realize Earth will be his only home for a long time and begin to love and care for it.
1.According to the passage, traveling to the planets will be ________.
A. much easier and even more interesting
B. far more exciting and dangerous
C. man’s final aim
D. man’s first step
2.Which of the following is Not true?
A. Mars is nearer to the earth than the moon.
B. The moon is much nearer to the earth than Mars.
C. Of all the planets, Mars is the nearest to the earth.
D. All the planets are much farther to the earth.
3.From the passage, we can guess ________.
A. there is life on Mars
B. there is no life on Mars
C. the atmosphere of Mars is not so dense as that of Venus
D. scientists will have little hope to find the answers
4.Man can live on under the conditions of _______.
A. much too hot surface B. the same pressure as we get on earth
C. normal atmosphere as we have on earth D. both B and C
Early in the morning of June 29, 1991, Carrier and Morgenstern were watching the field. Although they could see nothing through the thick fog, they kept their camera running.
By 6 a.m. the fog began to lift. A remarkable pair of circles had been flattened. Stalks (主茎) were bent but not broken. Outside the circles the wheat was untouched. Muddy though the field was, there were no footprints or other marks. The circles seemed to have come from nowhere. “I can’t explain it at all,” Mike Carrier said to himself with his eyes wide open.
Carrier is not alone since the early 1980s, more than 2000 circles have appeared in farmer’s fields. Most circles form at night between May and August.
Some believe the circles are caused by deer or some other animals. Others think of UFOs. “The circles are messages given by those who come from outer space,” says Michael Green. “Perhaps they are trying to get in touch with us.”
Pat Delgado has done research on crop circles since 1981. He believes that they are caused by “some form of earth energy.”
Most scientists think that there’s no scientific basis to back up Green’s or Delgado’s theories. Some of them say, “ We think they’re nothing but hoax(骗局).”
In September 1991, Doug Bower and Dave Chorley told newsmen that since 1979 they had made circles throughout southern England to fool people who believed in UFOs.
Since the early 1980s, Dr. Terence Meaden has visited more than1000 circles. Now he thinks he may have the answer. He believes true crop circles are made by vortex(旋风) which can flatten the crop in circular patterns.
Now crop circles are still found in southern England each summer. Are they really the traces of UFOs?
1.On the morning of June 29, 1991, Carrier and Morgensern hoped to ________.
A. record the important thing B. draw a conclusion
C. find a secret of nature D. see something funny
2.When he saw the crop circle, Mike Carrie was ________.
A. satisfied B. frightened
C. surprised D. interested
3.Most scientists consider that theories of Green and Delgado are ________.
A. meaningful B. reasonable
C. instructive D. against the laws of science
4.According to the article we may know that all the crop circles ________.
A. are made by those who come from outer space
B. are nothing but hoaxes
C. are not hoaxes
D. can be explained by scientists
