题目内容
8.How many things can you see in the night sky?A lot!On a clear night you might see the Moon,some planets,and thousands of sparkling stars.You can see even more with a telescope.And with bigger and bigger telescopes you can see more and more objects in the sky.And you can see those objects in more and more detail.
But scientists believe there are some things in the sky that we will never see.We won't see them with the biggest telescope in the world,on the clearest night of the year.
That's because they're invisible.They're the mysterious dead stars called black holes.
You might find it hard to imagine that stars die.After all,our Sun is a star.Year after year we see it up in the sky,burning brightly,giving us heat and light.The Sun certainly doesn't seem to be getting old or weak.But stars do burn out and die after billions of years.
As a star's gases burn,they give off light and heat.But when the gas runs out,the star stops burning and begins to die.
As the star cools,the outer layers of the star pull in toward the center.The star squashes into a smaller and smaller ball.If the star was very small,the star ends up as a cold,dark ball called a black dwarf (黑矮星).If the star was very big,it keeps squashing (塌缩) inward until it's packed together tighter than anything in the universe.
Imagine if the Earth were crushed until it was the size of a tiny marble.That's how tightly this dead star,a black hole,is packed.What pulls the star in toward its center with such power?It's the same force that pulls you down when you jump--the force called gravity.A black hole is so tightly packed that its gravity sucks in everything--even light.The light from a black hole can never come back to your eyes.That's why you see nothing but blackness.
So next time you stare up at the night sky,remember:there's more in the Sky than we can see!Scattered in the silent darkness are black holes--the great mystery of space.
32.According to the article,what causes a star to die?A
A.As its gases run out,it cools down.
B.It has a collision(碰撞)with other stars.
C.It can only live for about a million years.
D.As it gets hotter and hotter,it explodes.
33.Which of the following statements is NOT true?D
A.Black holes are dead stars.
B.Black holes have gravity.
C.Black holes are invisible.
D.There is nothing as mysterious as a black hole.
34.What happens AFTER a star dies?A
A.It becomes invisible.
B.It falls to Earth.
C.It gets cold with less gravity.
D.It becomes brighter and easier to see.
35.Why can't you see light when you look at a black hole?B
A.Because most black holes are so far away.
B.Because the gravity of a black hole is so strong that it sucks the light inward.
C.Because as the star's gases burn,it stops giving off heat and light.
D.Because as a star cools,its outer layers pull in toward its center.
分析 这篇文章主要向我们介绍了一些关于宇宙中星球的天文知识.利用天文望远镜我们可以观察到太空中更多的物体,更为详细地了解星星.还有一些我们看不到的星星,它们靠气体燃烧发光,当气体燃尽,它们便成为被叫做黑洞的神秘死星.
解答 32.A 细节理解题.根据第四段的But when the gases run out,the star stops burning and begins to die.描述,可知当气体燃尽,星星便停止燃烧,我们就开始看不到它们.故选A.
33.D细节理解题.文章没有提及白矮星与黑矮星的大小比较,故选D.
34.A推理判断题.根据第二段的that's because they're invisible.They're the mysterious dead stars called black holes.可知当星星成为被叫做黑洞的神秘死星后就看不见了,故选A.
35.B细节理解题.根据倒数第二段的A black hole is so tightly packed that its gravity sucks in everything-even light.The light from a black hole can never come back to your eyes.That's why you see nothing but blackness.可知,黑洞是如此紧密,它的引力吸收一切甚至是光.从黑洞发出的光永远不能回到你的眼睛.这就是为什么你看到的只是黑暗.故选B.
点评 本文是一个科技类阅读理解,题目涉及多道细节理解题,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据.
A. | as | B. | or | C. | but | D. | and |
A. | tried to help | B. | managed to help | ||
C. | tried helping | D. | succeeded to help |
A. | Step into; talking | B. | Stepping into; talking | ||
C. | Entering; talked | D. | Enter; talked |
Students of human migration speak of"push"and"pull"factors,which influence an individual's decision to move from one place to another.Push factors are associated with the place of origin.A push factor can be as simple and mild a matter as difficulty in finding a suitable job,or as traumatic as war,or severe famine.Obviously,refugees who leave their homes with guns pointed at their heads are motivated almost entirely by push factors.
Associated with the place of destination,pull factors are mostly economic,such as better job opportunities or the availability of good land to farm.In general,pull factors add up to an apparently better chance for a good life and material well-being than is offered by the place of origin.When there is a choice between several attractive potential destinations,the deciding factor might be a non-economic consideration such as the presence of relatives,friends,or at least fellow countrymen already established in the new place who are willing to help the newcomers settle in.Considerations of this sort lead to the development of migration flow.
Besides push and pull factors,there are what the sociologists call"intervening obstacles".Even if push and/or pull factors are very strong they still may be outweighed by intervening obstacles,such as the distance of the move,the trouble and cost of moving,the difficulty of entering the new country,and the problems likely to be encountered on arrival.
The decision to move is also influenced by"personal factors"of the potential migrant.The same push-pull factors and obstacles operate differently on different people,sometimes because they are at different stages of their lives,or just because of their varying abilities and personalities.The prospect of packing up everything and moving to a new and perhaps very strange environment may appear interesting and challenging to an unmarried young man and terribly difficult to a slightly older man with a wife and small kids.Similarly,the need to learn a new language and customs may excite one person and frighten another.
Regardless of why people move,migration of large numbers of people causes conflict.The newest arrivals are usually given the lowest-paid jobs and are resented by native people who may have to compete with them for those jobs.It has usually taken several decades for each group to be accepted into the mainstream of society in the host country.
Migration | ||
Passage outline | Supporting details | |
Broad (71)Definition of migration | Migration is permanent or semi-permanent change of residence. (72)More people move within nations than between nations,yet their motives are alike. | |
Factors in migration | Push factors | (73)Unable to find a suitable job or suffering from war or natural disaster,people are likely to leave their homeland. |
Pull factors | (74)Motivated/Influenced by pull factors,people are desperate for more chances to live a better life in the place of destination. Earlier settlers tend to offer help to new migrants,greatly (75)promoting migration flow. | |
Intervening obstacles | (76)Strong as push and pull factors might be,intervening obstacles seems more difficult for some to (77)overcome. | |
Personal factors | International migration may be interesting to those unmarried but not to those with a family; the same (78)thought/prospect of picking up a foreign language may make one excited but another frightened. | |
Impacts of migration | As a result of large numbers of the newest arrivals,conflicts between them and the natives will (79)arise/occur/appear.It usually takes long for the new comers to (80)fit in with the mainstream of the host country. |
Putin does a good job (43)DRussia great.People say that he is serious and capable.But young Putin wasn't a top student (44)B.His student's book and diary from 40years (45)D this.At a time when the top grade was five,Putin got three for maths and science.His art was (46)C worse,only two.What's your (47)Asubject?Putin liked German most.He wrote (48)B German when he was (49)D notes.He even put word cards in the textbook to remember German words!Have you ever (50)Awith friends in class?Putin did the same.He would secretly tell others (51)A
to say when the teacher was asking them for a (an) (52)C. (53)B seemed that young Putin was not good at remembering things.He (54)D forgot to finish his maths homework.Once he forgot to (55)B school uniform.His teacher had to (56)C him to get out of the classroom. (57)B
young Putin did very well in the moral class (品德课).He always got (58)Dmarks.He also showed a strong (59)A of his motherland at an early age.He wrote a poem for (60)C when he was in primary school.
41.A.born | B.living | C.growing up | D.staying |
42.A.president | B.government | C.power | D.live |
43.A.letting | B.earning | C.getting | D.making |
44.A.above all | B.at all | C.first of all | D.after all |
45.A.prepare | B.display | C.introduce | D.show |
46.A.very | B.not | C.even | D.too |
47.A.favorite | B.lovely | C.interesting | D.challenging |
48.A.with | B.in | C.for | D.by |
49.A.keeping | B.remembering | C.reading | D.taking |
50.A.talked | B.played | C.smiled | D.joked |
51.A.what | B.who | C.when | D.which |
52.A.question | B.word | C.answer | D.advice |
53.A.There | B.It | C.That | D.This |
54.A.ever | B.never | C.recently | D.sometimes |
55.A.put on | B.wear | C.dress | D.dress in |
56.A.make | B.let | C.tell | D.have |
57.A.And | B.But | C.So | D.Then |
58.A.all | B.whole | C.few | D.full |
59.A.love | B.kindness | C.interest | D.development |
60.A.his mother | B.his father | C.Russia | D.Russian |