1.Imagine the situation.You are driving along a desert or on a mountain.You have no idea where you are.You passed the last house two hours ago.Then your car breaks down.It is night and it is cold.You have no mobile phone.What do you do?Well,next time take a GPS with you.This invention may be able to help you.It is a device(裝置) which uses satellites (衛(wèi)星) to find the user's position(位置).It can find your position to within 20metres.A GPS cannot start your car,but at least you will know where you are.
GPS,which means Global Positioning System,is a small radio receiver.It looks like a mobile phone.You can hold it in your hand,or put in your pocket.It is sometimes put into a watch or a telephone.We also find GPS devices in cars,planes,or boats.Some of these devices have electronic maps,so you know where you are.For example,in a city they can tell you the name of the street.
There are three parts to the Global Positioning System.The first part is the receiver.You can hold it in your hand,or have it fixed into your car,plane,etc.The second part is a group of satellites orbiting the Earth.The receiver contacts at least four of the satellites and calculates(計(jì)算) its position.The third part of the system is a network of ground stations.They are all over the world.They control the satellites and make sure they are working well.
Some people think that in the future the GPS will be as common as the mobile.They are becoming cheaper and more and more accurate(精確的).There are also new uses for the GPS.Perhaps they will become like watches.Everyone will have one and you will never be lost again.
55.According to the passage,with the help of the GPS,peopleA.
A.can't be lost in a new city
B.can't find their way in different countries
C.can learn about the culture of an unknown place
D.can spend the least time getting to another place
56.The underlined word"They"in paragraph 3means"D".
A.Receivers
B.GPS devices
C.Satellites
D.Ground stations
57.What can we infer(推斷) from the passage?D
A.All GPS devices have electronic maps.
B.People in many countries will use the GPS for free.
C.The receiver of the GPS contacts at least five of the satellites.
D.The GPS will become more and more common in everyday life.
分析 這篇短文介紹GPS定位系統(tǒng).它可以在20米內(nèi)搜尋到你的位置,非常方便.有些裝置還置有電子地圖,并預(yù)測(cè)了為來的定位系統(tǒng)將會(huì)非常普及
解答 55.A細(xì)節(jié)理解題.根據(jù)短文第一段It can find your position to within 20 metres.A GPS cannot start your car,but at least you will know where you are.描述,可知衛(wèi)星定位系統(tǒng)能讓你知道自己在哪兒.故選A,不會(huì)在新城市中迷路.
56.D理解推斷題.聯(lián)系上句The third part of the system is a network of ground stations.描述,可知指的是地面接收站.故選D.
57.D主旨大意題.根據(jù)短文最后一段Some people think that in the future the GPS will be as common as the mobile.They are becoming cheaper and more and more accurate(精確的).There are also new uses for the GPS.Perhaps they will become like watches.可知衛(wèi)星定位系統(tǒng)在日常生活中會(huì)變得越來越普通.故選D.
點(diǎn)評(píng) 做題時(shí)要在理解好文意的基礎(chǔ)上,與題目有機(jī)的結(jié)合,從文章中找到相關(guān)細(xì)節(jié)性的句子與選項(xiàng)細(xì)細(xì)比對(duì),進(jìn)行選擇或推理判斷,選出符合文章內(nèi)容的正確選項(xiàng).做題注意靈活,有時(shí)可采用排除法或直選法確定出最終答案.