题目列表(包括答案和解析)
B
It is natural that children are curious about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.
As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.
Scientists spend their lives trying to find out about the world．Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .
These scientists have already discovered a lot about our world．For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.
Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.
We know a lot about our world, but there are still many answers that we do not have, and we are curious.
45．According to the passage, which of the following statements is true?
A．People are curious in the same way.
B．People in different countries are interested in different things.
C．Men and women are curious about different things.
D．People of different ages are interested in different things
46．Scientists who work with the biological sciences study____.
A．the earth , the oceans and the sky B．man-made things
C．plants and animals D．ocean water
47．When you run, your muscles need ____.
A．more nutrition and oxygen B．more signals C．more salt D．water
48．A rock cracks _____.
A．in wet regions B．in dry regions
C．at very high or very low temperatures D．when salty water falls in
A new report says only about half of all students in the main school systems of America’s largest cities finish high school.The report notes higher rates of graduation—more than seventy percent—in areas surrounding the cities.
The Editorial Projects in Education Research Center prepared the report.
Researchers studied high school graduation rates from the two thousand three，two thousand four school year.They also identified the nation’s fifty largest cities.The largest，New York City，had a population of more than eight million.The smallest city was Wichita，Kansas.It had about three hundred sixty thousand people.
Researchers used a system of measurement called the growing promotion index to find graduation rates.School officials in many of the cities studied say the resulting numbers were too low.That is because different areas use different methods to find graduation rates.Critics say many methods do not give a true picture of the number of students who leave high school before finishing.
Other studies have put the national graduation rate at about seventy percent.But experts agree that too many students are not completing high school.They estimate the number at more than one million each year.
The report was prepared for America’s Promise Alliance.The private group aims to help children receive services they need to succeed.
General Colin Powell was chairman of America’s Promise Alliance when it was formed in nineteen ninetyseven.He attended the press conference Tuesday where the report was released.He said studies have shown that the United States must do more to educate the leaders and work force of the future.
Secretary of Education Margaret Spellings also spoke.She said the government will propose that states use the same methods when reporting graduation rates.Alliance officials also announced the start of a nationwide campaign to improve graduation rates.It is to include a series of meetings to be held in every state over the next two years.The meetings will bring together elected leaders，business owners，students，parents and education officials.They will develop plans to increase the number of Americans who finish high school.
68．From the first paragraph，we can know________.
A．Most of the students in America don’t like to finish high school
B．Most of the students in areas surrounding the cities are willing to finish high school
C．American people don’t care about the education of their children
D．High schools in American aren’t good places to study in
69．Experts agree that the national graduation rate is lower than______.
A．70% B．80%
C．50% D．40%
70．Which of following statements is TRUE?
A．America’s Promise Alliance prepared the new report for the Editorial Projects.
B．The resulting numbers of the new report are different from other studies.
C．General Colin Powell is chairman of America’s Promise Alliance.
D．Margaret Spellings didn’t attend the press conference Tuesday.
A chocolate printer that allows sweet lovers to create 3D desserts by themselves is to go on sale at a cost of 2,500 pounds.
The machine squirts (喷射) out chocolate and, via computer instructions, allows the user to build any shape they like out of the food. But makers Choc Edge have missed the Easter rush. Even so, they hope the printer will be snapped up by retailers (零售商) immediately they come to the market. Britain’s biggest chocolatiers Thornton’s have already said they are interested. Because of the high cost, however, few individuals are likely to buy one. But the devicecould one day allow people to design their own 3D objects after submitting their designs on a website. Dr Hao, founder of Choc Edge came up with a prototype (原型) last year and has only just perfected it so that it can now go on sale. “We’ve improved and simplified the machine, so now it is really easy to use,” he told the BBC. “You just need to melt some chocolate, fill a syringe (注射器) that is stored in the printer, and get creative printing of your chocolate.”
3D printing is a technology where a three dimensional object is created by building up successive layers of material. The technology is already used in industry to produce plastic and metal products, but this is the first time the principles have been applied to chocolate. The research has presented many challenges. Chocolate is not an easy material to work with because it requires accurate heating and cooling cycles. Dr Hao said, “What makes this technology special is that users will be able to design and make their own products. From reproducing the shape of a child’s favourite toy to a friend’s face, the possibilities are endless. It could be developed to help consumers design many products from different materials, but we’ve started with chocolate as it is easily available, low cost and harmless.” “There is also no wastage as any spoilage (损坏物) can be eaten.” Dr Hao added, “Eventually we may see many mass-produced products replaced by unique designs created by the customer.”
EPSRC chief executive Professor Dave Delpy said, “This is a good example of how creative research can be applied to create new manufacturing and retail ideas. By combining developments in engineering with the commercial potential of the digital economy，We can see the new market prospect (前景)—creating new jobs and, in this case, the chocolate printer is called sweet business opportunities.”
B
It is natural that children are curious about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.
As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.
Scientists spend their lives trying to find out about the world．Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .
These scientists have already discovered a lot about our world．For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.
Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.
We know a lot about our world, but there are still many answers that we do not have, and we are curious.
45．According to the passage, which of the following statements is true?
A．People are curious in the same way.
B．People in different countries are interested in different things.
C．Men and women are curious about different things.
D．People of different ages are interested in different things
46．Scientists who work with the biological sciences study____.
A．the earth , the oceans and the sky B．man-made things
C．plants and animals D．ocean water
47．When you run, your muscles need ____.
A．more nutrition and oxygen B．more signals C．more salt D．water
48．A rock cracks _____.
A．in wet regions B．in dry regions
C．at very high or very low temperatures D．when salty water falls in
（B）
It is natural that children are curious about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.
As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. Then they become interested in the physical world around them: the plants, the animals, and the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career in science.
Scientists spend their lives trying to find out about the world. Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e.g., physics, chemistry.
These scientists have already discovered a lot about our world. For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is like a pump that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too. So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.
Of course, scientists cannot answer all of our questions. If we ask “Why does the ocean water taste salty?” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.
We know a lot about our world, but there are still many answers that we do not have, and we are curious.
46. Which of the following statements is true?
A. People are curious in the same way.
B. People in different countries are interested in different things.
C. Men and women are curious about different things.
D. People of different ages are interested in different things.
47. Scientists who work with the biological sciences study ______________________.
A. the earth, the oceans and the sky B. ocean water
C. plants and animals D. man-made things
48. When you run, your muscles need ______________________________.
A. more nutrition and oxygen B. more signals
C. more salt D. water
49. A rock cracks ________________________________________.
A. in wet regions B. in dry regions
C. at very high or very low temperatures D. when salty water falls in
50. People are always curious because _________________________.
A. they cannot explain many things B. they know nothing about the world
C. they know little about the world D. they want to be scientists
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