首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、A thrilling exploration in the desert. B、How GPS saved the survivors. C、What is GPS and how it works. D、The danger of space ex
A、A thrilling exploration in the desert. B、How GPS saved the survivors. C、What is GPS and how it works. D、The danger of space ex
admin
2018-05-10
33
问题
For three groups of explorers formed by college students and young white collars, it started out as a wonderful trip. They were enjoying themselves exploring the Inner Mongolian desert. But when the sandstorm came, the trip became a disaster.
The drama unfolded during the May Day holiday. One girl did not make it before the students were rescued. The group was eventually found with the help of a GPS receiver.
GPS, or global positioning system, is a satellite-based navigation system made up of a network of 24 satellites. It was originally created for military use by the US in 1980s but is now available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. And the[24]service is free.
GPS satellites circle the earth twice a day and transmit signals and information to the earth. GPS receivers take this information and calculate the user’s exact location. A GPS receiver must be locked on to the signals of at least three satellites to calculate the latitude and longitude of its location. With four or more satellites in view, the receiver can determine the user’s altitude. Once the user’s position has been determined, the GPS receiver can calculate other information, such as speed, direction, distance to destination, and a whole lot more.
22. What is true about the trip made by the young people?
23. What is the main topic of the passage?
24. Which of the following is true about the GPS?
25. What must be determined first before the GPS receiver can calculate other information?
选项
A、A thrilling exploration in the desert.
B、How GPS saved the survivors.
C、What is GPS and how it works.
D、The danger of space exploration.
答案
C
解析
主旨题应该概括且含有核心词,符合此要求的是C,全篇大部分文字都是在介绍GPS及其功用。
转载请注明原文地址:https://kaotiyun.com/show/yG47777K
0
大学英语四级
相关试题推荐
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyptandtheNileValley.Inthosedays,paperwasmade
SevenWaystoCreateaHappyHouseholdA)Everyfamilyisdifferent,withdifferentpersonalities,customs,andwaysofthin
Itseemstomethattoday’sprime-timeleaderneedsatop-5listthatclearlylaysouthisorherpriorities.Whetheryou’rerun
Thesearenoteasytimesforbooksellers,borders,abigAmericanone.ditcheditsbossinJanuaryandhasclosedstores,butis
A、Therighthand.B、Thelefthand.C、Bothhands.D、Itdepends.B原文提到,婴儿16周大时,主要使用左手进行触摸,因此B正确。
A、Hewasembarrassed.B、Hefeltgreatlyencouraged.C、Hefeltsad.D、Hewasdeeplytouched.D题目询问当Sam看到手表上面的字时,心里是什么感觉。关键是要听到“Sa
PreparingChildrentoBeSafeatCollege[A]Moneycanbuymanythingstohelpchildrenexcelacademically,liketutorsandpriv
Low-carbonFuture:WeCanAffordtoGoGreen[A]Tacklingclimatechangewillcostconsumerstheearth.Thosewhocampaignfora
DuringtheSecondWorldWar,doctorstriedtosaveseverelyburnedpilotswithgraftsofdonatedskin.Thegraftedskinlookedg
A、Twomechanicalpilotswilldothejob.B、Thegiantjetwillcrash.C、Thegiantjetwillbeforcedtoland.D、Theenginesofth
随机试题
【案例】患者男,70岁。以“反复咳嗽、咳痰20年,气短、下肢水肿10年,加重2周,神志不清1天”为主诉入院。每年冬季发作,咳白色黏痰,近2周上述症状加重,咳黄痰,出现明显呼吸困难,不能平卧。1天前因头痛、烦躁、夜间不能睡觉,家属给予地西泮2片,服后即入睡不
男,60岁。发热伴寒战、心悸7天,体温最高39℃,头痛、咳嗽、右大腿肿痛,病情渐重入院。查体:T38℃,P100次/分,R24次/分,BP100/75mmHg。神志清楚,巩膜轻度黄染,双肺呼吸音粗,无啰音,心脏无异常,腹平软、无压痛,肝区无叩痛右大腿中段红
国家重大建设工程合同,应当根据()订立。
下列各项中,属于企业支出的有()。
给定材料材料12015年5月,卫计委公布《中国家庭发展报告2015》,其中显示,城乡家庭收入差距明显,收入最高20%家庭是最低20%家庭收入的19倍。农村家庭间的收入不均等程度更大。前不久,一位外国摄影师拍摄的一组照片在网上热
碳汇造林正逐渐成为北方某市市民履行义务植树责任的形式之一。在经过几十年的营造和平原大造林后.该市适宜大规模造林的地方越来越少,由于路途遥远、交通问题、活动统筹困难等原因,组织大型植树活动也越来越困难,而人人都能参加的碳汇造林从根本上解决了这个问题。相关细则
有人说:“现在是建构主义学习的时代了,结构主义学习理论落后了。”请评述这种观点。
在采用点—点通信线路的网络中,由于连接多台计算机之间的线路结构复杂,因此确定分组从源结点通过通信子网到达目的结点的适当传输路径需要使用______。
[A]kitchen[B]plane[C]restaurant[D]garden[E]library[F]pencil[G]company
ThreeTipstoImproveYourPublicSpeakingSkills1.Childrenasyoungas【T1】______:showandtell【T1】______Numberonefear:【T
最新回复
(
0
)