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A black hole is created when a large star burns out. Like our sun, stars are unbelievably hot furnaces (熔炉) 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 dense that a teaspoon of matter from it weighs billion of pounds.
The more the star shrinks, 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 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. 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(处理) in the sky!
When the star begins to die ______.
A. there is no fuel left in it B. its outer layer goes into space first
C. a huge explosion will happen D. it doesn’t give off light any longer
Which of the following doesn’t help produce a black hole?
A. The gravity inside the star is very strong. B. The light can’t go out of the star.
C. The star becomes smaller and smaller D. The dying star shines very brightly.
The black hole ______.
A. continues becoming smaller and smaller all the time
B. goes into another universe and becomes a white hole
C. can pull in everything we know of in the world
D. will appear at another place at a different time
What’s the best title for this passage?
A. A New Scientific Discovery: Black Holes
B. How Do Black Holes Come Into Being?
C. What Are Black Holes?
D. Travel Through A Black Hole
查看习题详情和答案>>This is time of year when we think about giving and receiving presents. Can you find a little extra to give? On this page we suggest a few organizations you might like to help.
Littleton Children’s Home
We don’t want your money, but children’s toys, books and clothes in good condition would be very welcome.
Also—we are looking for friendly families who would take our children into their homes for a few hours or days as guests. You have so much—will you share it?
Phone Sister Thomas on 55671.
Children’s Hospice
We look after a small number of very sick children. This important work needs skill and love. We cannot continue without gifts of money to pay for more nursing staff. We also need story books and toys suitable for quiet games.
Please contact The Secretary, Little Children’s Hospice, Newby Road.w.^w.k.s.5*u.c.#o@m
Street Food
In the winter weather, it’s no fun being homeless. It’s even worse if you’re hungry. We give hot food to at least fifty people every night. It’s hard work, but necessary. Can you come and help? If not, can you find a little money? We use a very old kitchen, and we urgently need some new saucepans. Money for new ones would be most welcome indeed.
Contact Street Food, c/o Mary’s House, Elming Way, Littleton. Phone 27713.
Littleton Youth Club
Have you got an unwanted chair?—a record player?—a pot of paint?
Because we can use them!
We want to get to work on our meeting room!
Please phone 66231 and we’ll be happy to collect anything you can give us.
Thank you!
The Night Shelter
We offer a warm bed for the night to anyone who has nowhere to go. We rent the former Commercial Hotel on Green Street. Although it is not expensive, we never seem to have quite enough money. Can you let us have a few pounds? Any amount, however small, will be such a help.
Send it to us at 15, Green St, Littleton. Please make check payable to Night Shelter.
Reading the passage, you might like to help these organizations which work for
A．homeless and sick children
B．less fortunate members of our society
C．hungry people who have no beds to sleep in
D．friendly members of our society to help others
If you like children and can offer a happy family to a homeless child, you may go to .
A．Street Food B．Night Shelter C．Children’s Home D．Children’s Hospice
We can infer that .
A．there are too many social problems in this country
B．people are very poor during the time for giving presents
C．warm-hearted people like to give away money
D．this passage is taken from a local newspaper
If your child has grown up, you may take the child’s things to .
A．Children’s Home and Children’s Hospice B．Youth Club and Children’s Home
C．Children’s Hospice and Night Shelter D．Youth Club and Night Shelter
查看习题详情和答案>>A black hole is created when a large star burns out. Like our sun, stars are unbelievably hot furnaces (熔炉) 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 dense that a teaspoon of matter from it weighs billion of pounds.
The more the star shrinks, 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 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. 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(处理) in the sky!
When the star begins to die ______.
A. there is no fuel left in it B. its outer layer goes into space first
C. a huge explosion will happen D. it doesn’t give off light any longer
Which of the following doesn’t help produce a black hole?
A. The gravity inside the star is very strong. B. The light can’t go out of the star.
C. The star becomes smaller and smaller D. The dying star shines very brightly.
The black hole ______.
A. continues becoming smaller and smaller all the time
B. goes into another universe and becomes a white hole
C. can pull in everything we know of in the world
D. will appear at another place at a different time
What’s the best title for this passage?
A. A New Scientific Discovery: Black Holes
B. How Do Black Holes Come Into Being?
C. What Are Black Holes?
D. Travel Through A Black Hole
查看习题详情和答案>>A story from the Bible tells of old Babylon, where the men decided to build a tower that would touch the sky．But God was unhappy, and he made them speak different languages．They couldn’t understand each other, so their dream never came true．
Yet the dream remains alive: if all men speak the same language, they can do anything．L．L．Zamenhof from Poland was among the men who pursue this dream．He developed Esperanto（世界语）between 1877 and 1885．
As the most successful man-made world language, it is spoken by over two million people around the world．Last month, the World Esperanto Congress（大会）, dealing with language rights, ended in Sweden．The 2004 conference will be held in Beijing．Most Esperanto speakers are in Central and Eastern Europe and in East Asia, particularly Chinese mainland．
Esperanto has two advantages．First, it’s easy．Each letter has exactly one sound and there are just 16 basic grammar rules．The second advantage is that it belongs to no one country．But Esperanto has only reached a small number of people compared with natural languages widely used around the world-such as English or Chinese．While these languages are deeply connected with their nations and cultures, Esperanto doesn’t have this background．
Will Esperanto really become a global language? It remains a question．
The writer tells us a story at the beginning to ．
A．explain why men have been making the effort to create a language shared by all
B．explain why men now speak different languages
C．show the relationship between man and God
D．prove that language is very important
What does the underlined word “pursue” in the second paragraph mean?
A．“Realize”． B．“Work for”． C．“Be against”． D．“Follow”．
What is the basic difference between Esperanto and English?
A．More people speak English than Esperanto．
B．Esperanto words are easier to spell．
C．Esperanto has fewer grammar rules．
D．Esperanto is not supported by any country or culture．
What does the story mainly talk about?
A．Advantages and disadvantages of Esperanto．
B．Men’s dream of sharing the same language．
C．The most successful planned language-Esperanto．
D．Comparison of Esperanto and other languages like English and Chinese．
查看习题详情和答案>>This is time of year when we think about giving and receiving presents．Can you find a little extra to give? On this page we suggest a few organizations you might like to help．
Littleton Children’s Home
We don’t want your money, but children’s toys, books and clothes in good condition would be very welcome．
Also, we are looking for friendly families who would take our children into their homes for a few hours or days as guests．You have so much—will you share it?
Phone Sister Thomas on 55671．
Children’s Hospice
We look after a small number of very sick children．This important work needs skill and love．We cannot continue without gifts of money to pay for more nursing staff．We also need story books and toys suitable for quiet games．
Please contact The Secretary, Little Children’s Hospice, Newby Road．
Street Food
In the winter weather, it’s no fun being homeless．It’s even worse if you’re hungry．We give hot food to at least fifty people every night．It’s hard work, but necessary．Can you come and help? If not, can you find a little money? We use a very old kitchen, and we badly need some new saucepans．Money for new ones would be most welcome indeed．
Contact Street Food, c/o Mary’s House, Elming Way, Littleton．Phone 27713．
Littleton Youth Club
Have you got an unwanted chair?—a record player?—a pot of paint?
Because we can use them!
We want to get to work on our meeting room!
Please phone 66231 and we’ll be happy to collect anything you can give us．
Thank you!
The Night Shelter
We offer a warm bed for the night to anyone who has nowhere to go．We rent the former Commercial Hotel on Green Street．Although it is not expensive, we never seem to have quite enough money．Can you let us have a few pounds? Any amount, however small, will be such a help．
Send it to us at 15, Green St, Littleton．Please make check payable to Night Shelter．
Reading the passage, you might like to help these organizations which work for
A．homeless and sick children
B．less fortunate members of our society
C．hungry people who have no beds to sleep in
D．friendly members of our society to help others
We can infer that ．
A．there are too many social problems in this country
B．people are very poor during the time for giving presents
C．warm-hearted people like to give away money
D．this passage is taken from a local newspaper
If your child has grown up, you may take the child’s things to ．
A．Children’s Home and Children’s Hospice
B．Youth Club and Children’s Home
C．Children’s Hospice and Night Shelter
D．Youth Club and Night Shelter
查看习题详情和答案>>