A black hole is created when a large star burns out．Like our sun，stars are unbelievably hot furnaces（熔爐） that burn their own matter as fuel．When most of the fuel is used up，the star begins to die．
The death of a star is not a quiet event．First there is a huge explosion．As its outer layer is blasted off into space，the dying star shines as brightly as a billion suns．
After the explosion，gravity pulls in what's left of the star．As the outside of the star sinks toward the center，the star gets smaller and smaller．The material the star is made of becomes tightly packed together．A star is so solid that a teaspoon of matter from it weighs billion of pounds．
The more the star shrinks（收縮），the stronger the gravity inside it becomes．Soon the star is very tiny，and the gravity pulling it in is unbelievably strong．In fact，the gravity is so strong that it even pulls light into the star!Since all the light is pulled in，none can go out．The star becomes black when there is no light．Then a black hole is born!
That's what we know about black holes．What we don't know is this：What happens inside a black hole after the star has been squeezed into a tiny ball？Does it keep getting smaller and smaller forever？Such a possibility is hard to imagine．
But if the black hole doesn't keep shrinking，what happens to it？Some scientists think black holes are like doorways to another world．They say that as the star disappears from our universe，it goes into another universe．In other words a black hole in our universe could turn into a "white hole" in a different universe．As the black hole swallows（吞噬） light，the white hole shines brightly--somewhere else．But where？A different place，perhaps，or a different time--many years in the past or future．
Could you travel through a black hole？Right now，no．Nothing we know of could go into a black hole without being crushed（擠壓）．So far the time being，black hole must remain a mystery．
Black holes are a mystery--but that hasn't stopped scientists from dreaming about them．One scientist suggested that in the future we might make use of the power of black holes．They would supply all of Earth's energy needs，with plenty to spare．Another scientist wondered if a black hole could some day be used to swallow earthly waste--a sort of huge waste disposal（處理） in the sky!
（1）When the star begins to dieBB．
A．there is no fuel left in it
B．a(chǎn) huge explosion will happen
C．its outer layer goes into space first
D．it doesn't give off light any longer
（2）Which of the following doesn't help produce a black hole？AA
A．The dying star shines very brightly．
B．The light can't go out of the star．
C．The star becomes smaller and smaller
D．The gravity inside the star is very strong．
（3）The black holeDD．
A．continues becoming smaller and smaller all the time
B．goes into another universe and becomes a white hole
C．will appear at another place at a different time
D．can pull in everything we know of in the world
（4）What's the best title for this passage？BB
A．A New Scientific Discovery：Black Holes
B．What Are Black Holes？
C．What Are Black Holes？How Do Black Holes Come Into Being？
D．Travel Through A Black Hole
【考點(diǎn)】社會(huì)．
【答案】B；A；D；B
【解答】
【點(diǎn)評(píng)】
聲明：本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有，未經(jīng)書(shū)面同意，不得復(fù)制發(fā)布。
發(fā)布：2024/5/27 14:0:0組卷：1引用：2難度：0.4
相似題
-
1．English Schools There's no substitute for taking an English course in a high quality language school in an English-speaking country.Esl-lounge Student has partnered with some of the best language schools in the UK.Choose a school from below.We can offer discounts on English courses!
Burlington School，London
Burlington School is located in Parsons Green，15 minutes by underground from the centre of London.Our standard of teaching is high，with courses in General and Specialist English.The coffee bar is open all day serving freshly-cooked meals，and the school organises a range of social activities to complement （補(bǔ)充） the classes.Students live either in homestays or in one of our hostels.
See Burlington School courses and save 10%
University of Liverpool，English Language Centre
You can have confidence in the University of Liverpool，which is ranked in the top 1% of higher education institutions worldwide.While studying here，you will benefit from modern and dynamic English teaching methods in small classes of fewer than 16 students.
See University of Liverpool courses and save 12%
Interactive English School，Brighton
We are a small friendly school.Being a small school means we can cater for your individual needs more easily than larger schools can.All of our teachers are native speakers，qualified and experienced.Our prices are very affordable and start from ￡60 per week for fulltime courses of 20 lessons.
See Interactive English School courses and save 7%
New School of English，Cambridge
The New School of English is located in the beautiful city of Cambridge.The school is open all year and provides a range of English language courses for adults from all over the world（minimum age 16）.These courses cover General English as well as courses for professionals looking to focus on specific topic areas.They have a range of accommodation choices for students.
See New School of English courses and save 5%
（1）What can we know about Burlington School？
A．It is open all year.
B．It is located in London.
C．It provides no accommodation.
D．It offers no social practice classes.
（2）Which school offers the biggest discounts？
A．Burlington School.
B．New School of English.
C．University of Liverpool.
D．Interactive English School.
（3）How is New School of English different from the others？
A．It sets a strict age limit.
B．Its accommodation is optional.
C．Its teachers are qualified and experienced.
D．It offers General and Specialist English courses.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.6 -
2．Hi Judy!
You often complain to me that you always buy goods unreasonably on sale promotion（促銷(xiāo)）and feel it shameful after going back to your school dormitory with new things not needed，considering all the money you spend is your parents' income．
In fact，this is a common phenomenon，called impulsive buying，a buying unplanned and hard to control．It usually happens when a store offers discounts（打折）or sales promotion-a special way used by stores to get more customers，which means you may fall into its traps even without notice．
Stores，with a good knowledge of customers' psychology（心理），make use of it to drive business．Avoiding all the impulsive buying is a hard thing．However，knowing our psychology behind it and reducing the times when influenced by sales promotion may be useful．So you should keep calm when facing the sales promotion by keeping in mind what you really need．
Find out the conditions where you are likely to buy things blindly．When seeing a dress advertised at 20% off，do not concentrate on the discount，but warn yourself against falling into the trap of "saving money''．
Besides，do not forget the long-term effects of your choice when meeting a sales promotion．Short-term benefits，like excited feeling just after buying items encourage impulsive buying．But the long-term costs such as waste of money and the sense of shame really annoy you．When seeing the advertisements，remember what you really want to buy originally and warn yourself of that terrible feeling．Only in this way can you save money for really needed things．
Yours，
Rachel
（1）Judy felt it a shame to．
A．complain to others about the poverty of her family
B．waste her parents' money on unneeded things
C．buy cheap things at lower prices or with less money
D．rely on her parents for further education
（2）Which of the following is true of impulsive buying according to Rachel？
A．It is designed by shops to draw customers' attention．
B．It can be brought under control with the help of stores．
C．It is planned by buyers with the purpose of saving money．
D．It is done by customers without considering its bad effects．
（3）In face of sales promotion Judy is advised to．
A．have belief in her own immediate decision
B．check the quality of the goods at low prices
C．stay calm by thinking about what she really needs
D．take the chance to learn more about stores tricks
（4）How do buyers usually feel in the long run after buying discounted things？
A．Regretful．
B．Thrilled．
C．Relaxed．
D．Sceptical．發(fā)布：2025/1/10 8:0:1組卷：4引用：2難度：0.6 -
3．Ever since I graduated from high school I've worked in the factories surrounding my hometown every summer.However，making the transformation between school and full-time blue-collar work during the break never gets any easier.For a student like me who considers any class before noon to be unacceptable，getting to a factory by 6 o'clock each morning is suffering.My friends never seem to understand why I'm so relieved to be back at school or that my summer vacation has been anything but a vacation.
There are few people as self-confident as a college student who has never been out in the real world.People of my age always seem to overestimate the value of their time and knowledge.In fact，all the classes did not prepare me for my battles with the machine I ran in the plant，which would jam whenever I absent-mindedly put in a part backward or upside down.
The most stressful thing about blue-collar life is knowing your job could disappear over night.Issues like being laid off and overseas relocation had always seemed distant to me until my co-workers told me that the unit I was working in would shut down within six months and move to Mexico，where people would work for 60 cents an hour.
After working 12-hour shifts（輪班）in a factory，the other options have become only too clear. "This job pays well，but it's hell on the body，" said one co-worker. "Study hard and keep reading." she added.When I'm back at the university，skipping classes and turning in lazy re-writes seems too irresponsible after seeing what I would be doing without school.All the advice and public-service announcements about the value of an education that used to sound stale（陳腐的）now ring true.
My experiences in the factories have inspired me to make the most of my college years before I enter the real world for good.
（1）What does the author think of his summer holiday？
A．It was no holiday for him at all.
B．It brought him nothing but suffering.
C．It was a relief from his hard work at school.
D．It offered him a chance to make more friends.
（2）What can we infer about most college students？
A．They do better in the real world.
B．They are confident when they work.
C．They think too highly of themselves.
D．They are expert at handling machines.
（3）What is the biggest pressure for blue-collar workers？
A．A low income.
B．The lack of security.
C．An unstable location.
D．Less break.
（4）How did the working experiences change the author？
A．He became responsible for his work.
B．He learned to be more practical at work.
C．He began to respect blue-collar workers.
D．He came to appreciate his college education.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5