When we look at the sky and see a bright light moving quickly across it or coming towards the earth, we talk about seeing a “shooting star” or a “falling star”. These moving lights are not, in fact, stars at all. They are small pieces of matter from outer space, which burn up as they enter the Earth’s atmosphere. The correct name of them is meteoroids. Any pieces that make it to the Earth’s surface without completely burning up are known as meteorites. A meteor is actually the name given to the light we see when a meteoroid is burning up.
When a meteorite hits the Earth at speeds between 11 and 72 kilometers a second, it can do amazing damage. A very large meteorite could knock the earth out of its orbit. If this happened, all life on Earth would probably become extinct(灭绝). The path we follow around the Sun would change and as a result the Earth would become either much hotter or much colder. This change in temperature would affect sea levels and the amount of water in rivers. There would either be huge floods, which would cover most of the land with water, or the oceans would dry up and there would be a drought, which means a long period of time without rain. Either way, nothing could survive. If a large meteorite landed in the sea it would almost certainly cause tsunamis, which would race towards the land, destroying everything in their paths.
Although it is unlikely the Earth will be struck by a meteorite large enough to do that kind of damage, there is evidence of fairly large meteorites hitting the Earth in the past. In 1908 a large area of forest in Tunguska, Siberia was destroyed by a meteorite that came apart just before it hit the ground. The moon, however, has about three billion craters陨石坑caused by meteorites impacting影响 its surface. The reason more meteorites have reached the surface of the moon than the surface of the Earth is that the moon does not have enough atmosphere for the meteorites to burn up in. some of the meteorites that have reached the Earth’s surface have done considerable damage. Some scientists believe it was a change of climate caused by meteorites hitting the Earth that resulted in the extinction of the dinosaurs and other large prehistoric animals.
Scientists are especially interested in meteorites because they contain information about the solar system. It is widely believed by scientists that most meteorites are produced by collisions(碰撞) between asteroids (small planets). These collisions probably happened many billions of years ago. This means the physical and chemical structure of a meteorite can give scientists information about the early days of the universe.
【小题1】          The story is about ___.     

A.floods caused by meteors
B.matter from outer space
C.life on Earth millions of years ago
D.meteorites that have damaged the moon
【小题2】          The Earth has ___.                    
A.three billion craters
B.fewer craters than the moon
C.more craters than the moon
D.a thinner atmosphere than the moon
【小题3】          Some scientists believe the dinosaurs became extinct because ___.     
A.they were hit by meteors
B.meteorites landed on their nests
C.meteorites landed and changed the climate
D.they could no longer breathe the atmosphere
【小题4】          Meteors are ___.                                         
A.small planets
B.the same as asteroids
C.from broken parts of asteroids
D.the light we see when meteoroids hit our atmosphere


B
For all dinner tables, a glass of milk seems to be a must. At least it was when I was growing up. It is widely believed that milk is a must in building strong bones and teeth. There’s no doubt that dairy products, especially milk, are high in protein and calcium, and Vitamin D and Vitamin A are added to most milk products.
While it’s well known that our bones need calcium, some studies suggest that high calcium intake doesn’t necessarily lower a person’s risk for fractures(骨折). A Harvard study found that people who drank two or more glasses of milk had no greater protection from breaking a bone than those who drank a glass or less a week.
There is no doubt that we need calcium. Some anti-dairy supporters claim dairy products can lead to heart disease. Much of this claim is based on high-fat dairy products, like cheese and cream, which may indeed lead to some health problems. Some studies have linked high milk intakes with a risk of prostate(前列腺)cancer; this seems also to be caused by high-fat dairy products, but not by dairy products in general.
Although milk has always been regarded as the most important thing we need for our bones, one of the most important things in strengthening bones and reducing the risk of osteoporosis(骨质疏松)is weight-bearing exercise, such as jogging, walking, and weight lifting.
Perhaps we should think of dairy products as less like a nutrient and more like a food. If you like it, eat it. If not, find something else to eat. Some claims may not be completely true. When I eat cream, I’m not thinking about calcium, protein, or any such thing. I’m thinking it is delicious.
60.What is the best title for this passage?
A. Milk: is it really necessary for children?    B. The disadvantages of drinking milk.
C. Milk: is it really good for the body?      D. Milk causes health problems.
61.   For people who want to reduce the risk of osteoporosis, we can infer that the writer may suggest that they ________.
A. avoid milk with Vitamin D and Vitamin A added
B. spend some time exercising
C. take in as much calcium as possible
D. drink more than two glasses of milk every day
62.   Based on the passage, we learn the writer may agree that ________.
A. milk is the most important thing that we need for our bones
B. children should not be permitted to eat cream
C. children should drink milk whether they like it or not
D. milk should be considered more like a food than a nutrient
63.   What can we learn from the passage?
A. Some dairy products may harm our health.
B. Milk has the highest level of protein of any food.  
C. The writer seldom drank milk when he was young
D. People who drink milk every day are at a high risk of getting a heart disease.


More and more American parents, students, educators, political and business leaders have come to see the importance of Chinese on the world stage. As a result, Americans hoping to learn Chinese are growing in number though they face a lot of difficulties.
Liu Chuansheng, chairperson of the University Council at Beijing Normal University, talked about this situation. “There have been 300 million Chinese learning English, and I know that there are more and more Americans beginning to learn Chinese. I remember when I came to the U. S. there were only 250 schools offering Chinese classes; when I left in 2005, there were already 2,400 schools hoping to offer Chinese classes. Today more than 700 schools are offering Chinese classes, and 4,500 are planning to do so.”
“This is an important time in America. We have suffered from an economic crisis; there is swine flu(猪流感) ---- all part of our lives. We need to be competitive to deal with the world and make an effort to understand each other,” said Shuhan Wang, head of Chinese Language Initiatives at Asia Society. “The number of Chinese language teachers remains the key bottleneck,” she said. “And the need for specialized teachers becomes greater, as there is increasing popularity of early language learning ---- kindergarten through 8th grades.”
Jon M. Huntsman Jr., governor(州长) of Utah, has led his state to the front in teaching Chinese. “While math and science remain main studies,” he said, “language is going to be an important drive in education. Next year 82 schools will offer Chinese to 6,000 students.”
64. It is implied in the passage that the number of Americans learning Chinese is growing mainly because _______.
A. more and more Americans face a lot of difficulties
B. the number of Chinese learning English is growing
C. Chinese is widely used by actors all over the world
D. China is playing a more important role in the world
65. Liu Chuansheng’s talk mainly shows us _______.
A. how Americans are learning Chinese      B. why Americans are learning Chinese
C. that Chinese becomes popular in America  D. that China offers more Chinese classes there
66. The biggest problem with Americans learning Chinese is that _____.
A. the Chinese language is too difficult for them to learn
B. they don’t have enough teachers of Chinese in the USA
C. American children are not good at learning languages
D. teachers won’t work in kindergartens or primary schools
67. The proper title for the passage is _______.
A. Americans show great interest in learning Chinese
B. Americans show less interest in math and science
C. Chinese teachers get new chance to work in America
D. Chinese is widely used in some states of America

New technology that can “ see ” through clothing and detect what ’ s underneath can now be used to scan crowds, making it a potentially effective tool to prevent terrorist attacks in public places.

The Thru Vision T5000 camera picks up Terahertz rays ,or T-rays, which are naturally sent out by all objects and can pass through clothes or even walls. The camera can then detect metallic and nonmetallic objects hidden under clothing on still or moving subjects without showing any body detail.

While similar technology is seen at airports around the world, the T5000 is designed to be used in large, open areas. With a range of 25 meters, the T5000 can screen people in public places, thus avoiding bottle-necks at border crossing or security checkpoints. It also means people can be screened without knowing it.

The technology develops from British astronomers ’ work in studying dying stars. Astronomers use T-ray cameras to see through dust and clouds in space. The company sees uses for its camera at other sites where political or business activities take place.

For privacy concerns,Thru Vision Chief Executive Clive Beattie said the image produced by the camera did not show detailed parts of the body. ” It's almost a shining light bulb(灯泡).“ Beattie said. "You don' t see the detail that people might be concerned about. “ In London' s busy Piccadilly Circus—which is already filled with closed -circuit surveillance (监视)cameras— reaction to the new technology was mixed. Some said the camera was going too far and violating privacy,but others said they are willing to put safety before privacy concerns. “ There ’ s surveillance everywhere anyway, “ said one commuter. “I don' t think it’ s much of a difference. I don' t care that they can see through me because they can see me anyway.“

Some experts said the privacy violation of the camera was not worth the benefit. “ What we should consider is how much we want to lose our privacy in order to obtain a sort of national security,” said David Murakami Wood,director of the Surveillance Studies network,which deals with surveillance and privacy problems. “ In most cases this isn' t real security—it ’ s a sense of safety that has very little real effect. ”

1..

 What can we learn about T5000?

A. It can detect metallic and nonmetallic objects underneath.

B. It can see through clothing or walls by sending out T-rays.

C. It was first used to observe stars by astronomers.

D. It is widely used at airports around the world.

2..

 What is the most probable purpose of the new invention?

A. To improve people ’ s life standard. B. For scientific research.

C. For commercial benefits.          D. For safety reasons.

3..

 Which is most probably the opinion of people on using the new camera?

A. Some agree to its use as it is new technology to protect privacy.

B. Some agree to its use because safety is the most important.

C. Some don' t agree to its use because it makes no difference.

D.Some people don' t care because they know little about it.

4..

What' s the main idea of the last paragraph?

A. Safety is more important than privacy.

B. T5000 is more beneficial than harmful.

C. T5000 does not really provide security.

D. It's not worth giving up privacy for safety.

 

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