【正文】 (2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare but if one did fall. It would be the end of the world. “If we don’t take care of these bid asteroids, they’ll take care of us,” says one scientist. “it’s that simple.”　　The cure, though, might be worse than the disease. Do we really want fleets(艦隊，車隊) of nuclear weapons sitting around on Earth? “the world has less fear from doomsday(毀滅性) rocks than from a great nuclear fleet set against them.” Said a New York Times article.　( )1. What does the passage say about asteroids and meteoroids? 　　 A. They are heavenly bodies different in position.　　 B. They are heavenly bodies similar in nature.　　 C. They are more asteroids than meteoroids.　　 D. Asteroids are more mysterious than meteoroids.　( )2. What do scientists say about the collision of an asteroid with Earth?　　 A. It is very unlikely but the danger exists. B. Such a collision might occur once every 25 years.　　 C. Collisions of smaller asteroids with Earth occur more often than expected.　　 D. It’s still too early to say whether such a collision might occur.　( )3. What do people think of the suggestion of using nuclear weapons to alter the course of asteroids?　　 A. It sounds practical but it may not solve the problem.　　 B. It may create more problems than it might solve.　　 C. It is a waste of money because a collision of asteroids with Earth is very unlikely.　　 D. Further research should be done before it is proved applicable. ( )4. We can conclude from the passage that ______.　　 A. While pushing asteroids off course nuclear weapons would destroy the world.　　 B. Asteroids racing across the night sky are likely to hit Earth in the near future.C. The worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime. 　　 D. Workable solutions still have to be found to prevent a collision of asteroids with Earth. 　( ) of the following best describes the author’s tone in this passage?　　 A. Optimistic(樂觀的) (批評的) C. Objective(客觀的) D. Arbitrary(武斷的) Key ：B A B D C ( B) Do animals have a culture? What do we mean by “culture?” Lately social scientists have begun to ask if culture is found just in humans, or if some animals have a culture too. When we speak of culture, we mean a way of life a group of people have in mon. Culture includes the beliefs and attitudes we learn. It is the patterns of behavior that help people to live together. It is also the patterns of behavior that make one group of people different from another group. Our culture lets us make up for having lost out strength, claws, long teeth, and other defenses. Instead we use tools, cooperate with one another, and municate with language. But these aspects of human behavior, or “culture,” can also be found in the lives of certain animals. Animals can make tools, for example. We used to think that the ability to use tools was the dividing line between human beings and other animals. Lately, however, we have found that this is not the case. Chimpanzees(非洲小猩猩) can not only use tools but actually make tools themselves. Animals can also share knowledge with each other and use their own language to municate. So it may be important for us to know that the line dividing us from animals is not as clear as we used to think.　( )1. Choose the statement that best expresses the main .　　 A. A chimpanzee can learn to use sign language to make sentences　　 B. Other animals can invent tools　　 C. Knowledge and munication are no longer signs of only human behavior　　 D. The line dividing human culture from animal culture is not as clear as we might think　( )2.“Culture” refers to ____.　　 A. book language of behavior we learn　B. the patterns of behavior we learn　　 C. traditional ideas 　D. people’s good habits　( )3. A chimpanzee’s use of tools means ____.　　 A. animals are the same as human beings　　 B. animals can be as clever as human beings　　 C. the dividing line between culture and animal culture no longer exists　　 D. animals may have a culture like our own　( )4. Which of the following statement is true?____.　　 A. The ability to use language separates human beings 　　 B. We can be certain that animals have a culture too　　 C. Social scientists doubt if animals have a culture too　　 D. Some traditional ideas about the difference between human beings and animals may be wrong　( ) first sentence of the second paragraph “Our culture lets 7us make up for having lost our strength, claws, long teeth, and other defenses “ means ____.　　 A. as a result of our culture, we have lost our strength, claws, long teeth, and other defenses　　 B. our culture has enabled us even better th