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A very important world problem—in fact, I tend to say it is the most important of all the great world problems which face us at present time—is the rapidly increasing pressure of population on land and on land resources.
It is not so much the actual population of the world but its rate of increase, which is the most important. It works out to be about 1.6 percent net annual increase. In terms of numbers this means something like 40 to 55 million additional people every year. Canada has a population of 20 million, rather less 6 months’ climb in world population. And there are 10 million people in Australia. So, it takes the world less than three months to add to itself a population, a population of that vast country. Let us come to our own crowded country—England and Wales; 45—50 million people—just about a year's supply. By this time tomorrow, and every day, there will be added to the earth about 120,000 extra people—just about the population of the city of York.
I am not talking about birthrate. This is net increase. To give you some idea of birthrate, look at the second hand of your watch. Every second three babies are born somewhere in the world. Another baby! Another baby! Another baby! You cannot speak quickly enough to keep pace with the birthrate.
This enormous increase of population will create immense problems. By 2010 A. D. unless something desperate happens, there will be as many as 7,000,000,000 people on the surface of this earth! So this is a problem which you are going to see in your lifetime.
1. The topic for the passage is .
A. The Lack of Land Resources B. Population Explosion
C. Your Lifetime D. The Birthrate
2. According to the author, is the most important for population pressure.
A. the net increase rate B. the birthrate
C. the enormous amount of world population D. the population explosion in Australia
3. It can be learned from Paragraph 2 that _.
A. in more than 6 months, to the world population 20 million will be added
B. three months later, to the population in the world 10 million will be added
C. in less than three months, to the world population 10 million will be added
D. one year later, the population of England and Wales will be doubled
4. Which of the following is TRUE?
A. After 24 hours, 120 thousand babies were born.
B. The birthrate is 180 babies every minute.
C. During a year, about 45 million people are born.
D. After a day, York will have 120,000 extra people.
5. "...something desperate happens" in the last paragraph can be best replaced by .
A. the world wars break out
B. people are in despair
C. birth control policy is adopted
D. people realize the seriousness of the population problem
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
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A recent survey of teachers found that an unhealthy passion with celebrity culture is having a negative impact on British students’ studies and it discovered that celebrity couple, the Beckhams, are the favorites among most students. Many students are ignoring building their own careers to seek a chance at fame instead, the Association of Teachers and Lecturers (ATL) survey found.
Almost two-thirds of teachers said sports stars were the type of celebrity many pupils wanted to follow while more than half of students wanted to be pop stars.
The survey said the celebrities that students aspired to mostly were David and Victoria Beckham who live in Los Angeles now. Soccer player Beckham is on the top of the survey while in second place, with almost a third of the survey’s votes, was his 33-year-old pop star wife.
Almost half of the 300 teachers surveyed said pupils tried to look like or behave like the celebrities they most admired, with some girls even dressing "unsuitably".
"We are not surprised about the influence of celebrity culture in schools —it reflects the current media passion with celebrities and the effect of celebrity culture on society as a whole," ATL general secretary Mary Bousted said in a statement.
"Celebrities can have a positive effect on pupils. They can raise pupils’ aspirations and desires for the future. However, celebrity culture can spread the idea that celebrity status is the greatest achievement and reinforce the belief that other career choices are not as valuable," said one primary school teacher. "Too many of the pupils believe that school success is unnecessary, because they will be able to get fame and fortune quite easily through a reality TV show."
The story mainly tells us that ______.
A. the Beckhams are mostly admired in Britain
B. most students think that being pop stars is more valuable than other career achievements
C. the celebrity passion has a harmful impact upon British students’ studies
D. a survey was made recently about the popularity of the stars
According to the survey, Victoria Beckham ______.
A. is a pop star most students admire
B. goes in the second place of the celebrities admired
C. won two-thirds of the votes
D. lives in New York now
Why does the author mention that pupils tried to look like or behave like the celebrities they most admired, with some girls even dressing “unsuitably”?
A. The pupils think it interesting to pretend to be the celebrities.
B. The behavior or the dress of celebrities can be followed as examples.
C. The author wants to show the negative influence these celebrities had on the students.
D. The author just wants to show being pop stars is very valuable to the students.
What is not TRUE according to the story?
A. Celebrities can’t have positive impact on the students.
B. Beckham and Victoria are husband and wife.
C. The so-called celebrity culture does harm to the pupils’ ideas about achievement.
D. Many students believe that school success is unnecessary.
The best title of the story is _____.
Sports Star David Beckham
B. Survey of Students about Celebrities
C Harmful Effect of Celebrities on Students
D. Better to Be Pop Stars Than Sports Stars
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 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>>