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1、Unit 4Astronomy: the science of the stars(时间：90分钟满分：110分)第一部分阅读理解(共两节；满分30分)第一节(共10小题；每小题2分，满分20分)阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。AWhat science fiction (story) once told about other worlds far away is now a fact. Astronomers (experts at the science of the universe) prove another solar(of the sun)
2、system like ours with some planets in the constellation Andromeda(仙女座)Geoffrey Marcy is a professor of astronomy and physics at San Francisco State University and says, “What we have found now，for the first time ever, is indeed a fullygrown systemof planets around the star Upsilon Andromeda. It appe
3、ars to have three planets，one close in，one at a middle distance，and one farther out. The star is slightly larger than our sun. The planets are huge，like our Jupiter(木星)”Marcys partner in this research，Debra Fischer, describes the solar system，“Here are the inner planet that goes around every 46 days
4、, the middle planet that goes around every 242 days, and then the outer planet that goes around every three and a half to four years.”Astronomically, its not far away, 44 light years. The sun of that solar system，Upsilon Andromeda，is so near and bright that it can be seen by using no equipment durin
5、g summer and fall.For twelve years astronomers searched the skies in the belief that if our sun has planets around it, surely others do, too. Geoffrey Marcy says, “And then starting three and a half years ago, we began finding for the first time planets singly, one planet here around one star.” “Whe
6、n I look up at the stars now at night, I can imagine easily that every one of them has planets around them，” says Debra Fischer.It was a tremble (shaking)in the star that led Marcy to the planets. “The star rocks around due to the gravity of the planet as a dog owner gets pulled around by a little d
7、og.”Can they support life? We dont know, because present technology is not advanced enough to determine what the planets are made of. That, Marcy says，is astronomys next challenge.1Whats the relation between Andromeda (A), Upsilon Andromeda system(U)and the mentioned three planets(P)?ABCD答案与解析：B推理判断
8、题。通读全文可知Andromeda是一个星座，像太阳系；Upsilon Andromeda是一颗恒星，像太阳；three planets是它的三个卫星，因此可推出B项正确。2According to Debra Fischer，in the new solar system, _.Athe farther a planet is from the star, the longer it takes to go around the starBthe larger a planet is，the shorter it takes to go around the starCit takes al
9、l the planets around three and a half to four years to go around the starDthe planets move around the star at the same(均匀) speed答案与解析：A推理判断题。根据天文常识及本文所述，任何行星的卫星的运转周期不可能是一致的，越是远离行星，一般运转周期越长。3What led to Marcys discovery of the planets?AThat he found a dog owner was pulled by his dog.BThe tremble of U
10、psilon Andromeda.CThat any planet has gravity.DThat he believes any star has its planets.答案与解析：B细节理解题。由倒数第二段可知。4We can infer that the scientists are _.Ato find out whether the planets can support lifeBto find means to communicate with the living beings on the planetsCto find means to travel to the p
11、lanetsDsoon to be able to answer the question of whether there is life on these planets答案与解析：A推理判断题。其他几项提到的不是本文重点或没提及。BThe earth is the only planet that scientists think has life. Why does the earth have life while the other planets (行星) dont? For one thing, the earth is just the right temperature.
12、As the_third_planet from the sun, the earth seems to be just the right distance away. The planets which are closer to the sun are hot that their surfaces bake (烘烤) in the sun. The farthest planets are cold balls.When the earth developed which scientists believe may have happened about 4 billion year
13、s ago many gases covered the earth. The gases caused the earth to be hot. But something wonderful happened. The temperature was just right for thick clouds to form. It rained very hard for a very long time. This gave the earth its oceans. Water made it possible for plants to grow. The plants created
14、 oxygen in the atmosphere. Oxygen is the gas that humans and animals breathe.Only one other planet in the solar system seems to be something like the earth. That planet is Mars (火星). Mars is smaller than the earth, and it is quite a bit cooler. But it is not too cold for humans. On some days, the te
15、mperatures are as low as a winter day in the northern United States. If you wore a special space suit, you could walk around on Mars. You would have to bring your own air to breathe, the air on Mars is too thin to breathe.Mars has the largest volcano (火山) in the solar system. It is sixteen miles hig
16、h. The highest volcano on the earth is five miles high. The most unexpected (未预测到的) sight on Mars is dried up river beds. Scientists believe that Mars was once much better than it is now. Does this mean there could have been living things on Mars? Scientists are not sure, but there has been no sign so far.5Which of the followi
