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1、精选优质文档-倾情为你奉上说明文类 (I) Water goes around and around Earth in a never ending journey called the water cycle（循环）. The sun heats up lakes, oceans, and other wet places on Earth. When the water gets warm enough, it changes into vapour. Plants also give off lots of water vapour. Some of this water vapour
2、cools off high in the sky and becomes clouds. Then it falls back to Earth in a new place as rain or snow. This cycle happens over and over again. The ground can absorb water like a sponge (海绵). If you could see this groundwater, it wouldnt look like a lake or river. The groundwater is mixed in with
3、the rocks and sand that lie in layers(层) below Earths surface. Groundwater moves along slowly. How slowly? Maybe 1.5 kilometres in one century. Some of this water has been underground for thousands of years. And once groundwater is pumped out of the ground from a deep well（井） by people, it may take
4、hundreds of years for another water to take its place.35.In which order does water go around Earth? a .Fall down as rain or snow. b. Heated up by the sun on lakes, oceans and other wet places. c. Cool off high in the sky. d. Form clouds. e. Change into vapour. A. dacbe B. becda C. caebd D. bceda36.
5、The groundwater seems to_. A. be just on the ground B. be pure water like that in a lake or river C. exist in rocks and sand D. flow along like rivers or streams37. The underlined word “pumped” in the passage can be replaced by_. A. run B. pushed C. drawn D. picked38. What conclusion（结论） can we draw
6、 from the passage? A. Groundwater can be quickly replaced by other water once pumped out. B. Groundwater is very valuable. C. Groundwater has nothing to do with human beings. D. Groundwater travel in an unknown way.1-4 BCCB(II) Satellites are an important part of our ordinary livesFor example, the i
7、nformation for weather forecasts is sent by satelliteSome satellites have cameras which take photographs of the Earth to show how clouds are movingSatellites are also used to connect our international phone callsComputer connections of the World Wide Web and Internet also use satellites. Many of our
8、 TV programs come to US through satellitesAirplane pilots also sometimes use a satellite to help them find their exact locationWe use satellites to send television pictures from one part of the world to anotherThey are usually 35，880 kilometers above the equatorSometimes we can see a satellite in th
9、e sky and it seems to stay in the same placeThis is because it is moving around the world at 11，000 kilometers an hourexactly the same speed that the earth rotatesA satellite must orbit the Earth with its antennae(天线)facing the earthSometimes, it moves away from its orbit，So there are little rockets
10、 on it which are used to put the satellite back in the right positionThis usually happens about every five or six daysSpace is not empty! Every week, more and more satellites are sent into space to orbit the EarthA satellite usually works for about 10-12 yearsSatellites which are broken are sometime
11、s repaired by astronauts or sometimes brought back to Earth to be repairedOften，very old or broken satellites are left in space to orbit the Earth for a very long timeThis is very serious because some satellites use nuclear power and they can crash into each other1Which of the following is NOT done
12、by satellites according to the passage?ASending information for weather forecast BTaking photographs of the EarthCSending TV picturesDProviding food for airplane pilots2Whats the speed the earth rotates at?A35,880 kilometers per hour B335,880 kilometers per hourC11,000 kilometers per hour D110,000 k
13、ilometers per hour3Why does the satellite move around the world at the same speed as the Earth rotates?AIn order to take photographs BIn order to stay in a certain position in the orbitCIn order to move away from its orbitDIn order to send television pictures4What does the underlined word “This” in
14、the 3rd paragraph refer to?AA satellite BA little rocketCA satellite seems to stay in the same place in the skyDThe satellite puts the rockets in the right position5Which is true of satellites?AA satellite usually works for about 10-12 yearsBEvery time a satellite gets broken，it is brought back to t
15、he Earth to be repairedCA broken satellite is never left in spaceDThey often crash into each other1-5 DCBCA(III) Cancer researchers urged people on Wednesday to take more vitamin D to lower risk of cancer, saying studies showed a clear link. “Our suggestion is for people to increase their intake (吸入，摄入), through diet or a vitamin supplement,” Dr. Cedric Garland said in a telephone interview.Garlands research tea
