7.阅读短文,从各题所给的选项中,选择最佳选项.
Imagine the situation.You are driving along a desert or on a mountain.Then your car breaks down.You have no idea where you are.What should we do?Well,next time take a GPS with you.It is a device(设备) which uses satellites to find the user's position.It can find your position within 20meters.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 it 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(绕) the Earth.The receiver contacts(联络) at least four of the satellites and calculates(计算) its position.The third part of the system is a net work 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(精确的).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.
66.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 find their position within 2000kilometers
67.We can learn from the passage thatA.
A.there are three parts to the GPS
B.a GPS can't be put into the watch
C.a GPS can help you start your car
D.the GPS devices are becoming more and more expensive
68.The underlined word"they"in paragraph 3means"D".
A.receiversB.GPS devices
C.a network of ground stationsD.satellites
69.The passage is mainly aboutB.
A.the history of the GPSB.the introduction of the GPS
C.the shape of the GPSD.the price of the GPS
70.what can we infer(推断) from the passage?D.
A.All GPS devices have electronic maps.
B.People all over the world 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 这篇短文主要介绍了卫星定位系统的工程及工作原理.卫星定位系统能让你知道自己在哪儿,不会在新城市中迷路.卫星定位系统有三个部分,第一部分是接收机.第二部分是一组围绕地球卫星接收器触点.第三个部分的系统是一个地面站网络.卫星定位系统在日常生活中会像手机一样普遍.
解答 答案:66.A 细节理解题. 根据第一段句子It can find your position within 20 meters.A GPS cannot start your car,but at least you will know where you are,它可以在20米内找到你的位置.GPS无法启动你的车,但至少你会知道你在哪里.可知卫星定位系统能让你知道自己在哪儿.不会在新城市中迷路.故选A.
67.A 细节理解题.根据第三段句子There are three parts to the Global Positioning System.全球定位系统有三个部分,可知卫星定位系统有三个部分.故选A.
68.D 细节理解题.根据第三段句子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第三部分是一个地面站网络,他们遍布世界各地,他们控制的卫星,确保它们正常工作;可知这里they意为地面站;故选D.
69.B 主旨归纳题.根据整篇文章内容及其第二段句子GPS,which means Global Positioning System,is a small radio receiver全球定位系统(GPS),这意味着全球定位系统,是一种小型无线电接收机.可知这篇短文主要介绍了卫星定位系统的工程及工作原理.即介绍卫星定位系统.故选B.
70.D 细节理解题.根据最后一段句子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(精确).可知卫星定位系统在日常生活中会变得越来越普通.故选D.
点评 在通读全文的基础上,根据全文大意,展开逻辑思维,瞻前顾后,认真观察选项,仔细推敲,确定最佳答案.