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 vegetarian（素食者）diet may help to protect people against cancer, a UK study suggests. Analysis of data from 52,700 man and women shows that those who did not eat meat had significantly fewer cancers than those who did.
Published in American Journal of Clinical Nutrition, the findings were worth looking into .Although it is widely recommended that people eat some fruits and vegetables every day to reduce their risk of cancer and other diseases, there is very little evidence showing that a vegetarian diet can surely reduce cancers .
But surprisingly, the researchers also found a higher rate of colorectal（直肠的）cancer – a disease connected with eating red meat – among the vegetarians.
Study leader Professor Tim Key, a researcher at the University of Oxford, said no previous study had looked at the diet in this way and that there had been a lot of confusion about the issue.
“It’s interesting – it suggests there might be some reduction in cancers in vegetarians, but we need to look carefully at that”, said the professor.
More work is needed to show the connections between diet and cancer but such studies are very hard to do. Dr Joanne Lunn, a senior nutrition scientist at the British Nutrition Foundation, said the findings highlighted the fact that cancer is a complex disease and many different lifestyle factors play a part in determining a person’s risk.
73. What would be the best title for the passage?
A. Reasons for getting cancers.
B. Vegetarians get fewer cancers.
C. Tips on avoiding cancers.
D. A surprising discovery on colorectal cancer.
74. Why are the findings worth looking into?
A. They can encourage healthy eating.
B. They show that cancer is a complex disease.
C. they show a brand new discovery.
D. They have been published in American Journal of Clinical Nutrition.
75. We can learn from the passage that _________.
A. people eating red meat are unlikely to get colorectal cancer
B. the diet is one of the many factors that determine a person’s health
C. the connections between a vegetarian diet and cancer are clear through the research
D. scientists will soon figure out the relationship between the diet and cancer

Do you like sitting on the edge of your seat? How about falling off it laughing? If so, "Rush Hour 1" is the perfect movie for you. Although it didn’t get the best reviews, it is perfect for those who like a good comedy.
Just as in the first "Rush Hour," Inspector Lee (Jackie Chan) and LAPD Detective James Carter (Chris Tucker) are partners. This time, they are on vacation in China and Carter is looking for a good time, but they are on the job again when a bombing at the American Embassy kills two customs agents. Lee and Carter go to look for a suspect named Ricky Tan. For Lee this is a serious case because Tan killed his father. Will Carter and Lee be able to capture Tan?
Another reason to see this movie perhaps is for the thrilling action, which includes karate fights with Jackie Chan. One of my favorite scenes shows Carter and Lee in a massage parlor (店堂) when everything goes crazy.
"Rush Hour 2" is, of course, really funny with Chris Tucker in the lead role. Chan and Tucker have many clever jokes and remarks. Some of the jokes aren’t enjoyed by the critics, but most will find them entertaining.
With no doubt, the movie was great. I was filled with anxiety about what was going to happen next. Many critics say that sequels (续集) are not as good as the original but this one is great. I especially enjoyed it because the special effects are minimal so everything looks as though it actually happened. The lighting effect is great as well as the sound.
So, if you are looking for a great action movie that leaves you at the edge of your seat and makes you laugh quite a bit, you should rush to see “Rush Hour 2.”
【小题1】According to the author, "Rush Hour 2" is a perfect movie particularly ______.

Although it will rain tomorrow,the railway workers will still go on a march.

请认真阅读下面短文，并根据所读内容在文章后表格中的空格里填放最恰当的单词。
注意：每个空格只填1个单词。请将答案写在答题卡上相应题号的横线上。
AIDS (Acquired Immune Deficiency Syndrome ) is a medical condition caused by HIV (Human Immunodeficiency Virus), a virus which damages people’s natural defenses against disease. So far, no cure has been found for it.
In the early mid-1980s, while other parts of the world were beginning to deal with the serious disease, Asia remained relatively unaffected by this newly discovered health problem. By the early 1990s, however, HIV and AIDS had hit several Asian countries, and by the end of that decade, HIV was spreading rapidly in many areas of the continent. Today, HIV and AIDS are a growing problem in every region of Asia. The latest statistics produced by UNAIDS suggest that in 2008, over 5 million people were living with HIV or AIDS in Asia.
Various factors cause the spread of HIV, including poverty, inequality, unequal status of women, cultural myths about sex and high levels of migration（移民）. Although it’s useful to understand the situation of AIDS in Asia as a whole, each country in the region faces a different situation. In Cambodia and Thailand, there has been evidence of declines in HIV infection levels. In Indonesia, Pakistan and Vietnam, meanwhile, the number of people living with HIV has rapidly increased. In China, the number of people newly infected with HIV and AIDS is also rising although at a much slower pace.
Much improvement is needed to prevent HIV and AIDS around Asia. New guidelines and policy documents have been continually issued over the years. Most of the successful programs do have at least three features in common. Firstly, these programs encourage HIV and AIDS education among the general population to teach people how to avoid infection and to face discrimination. Secondly, they are every practical and they involve the infected people themselves in program design and implementation（实施）. Last but not least, strong leadership is essential for HIV prevention. If all of the leaders truly committed themselves to this cause, them a great many lives would be saved.