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
Transportation For many years in the desert, camels used to be the only form of transportation(运输). Before the(51)of modern trai
Transportation For many years in the desert, camels used to be the only form of transportation(运输). Before the(51)of modern trai
admin
2012-09-10
22
问题
Transportation
For many years in the desert, camels used to be the only form of transportation(运输). Before the(51)of modern trains, camel trains used to carry all the goods for trading between Central Africa and Europe. Traders sometimes(52)to put together camel trains with 10,000 to 15,000 animals. Each animal often carried(53)400 pounds and could travel twenty miles a day. This form of transportation was so important that camels were called the "ships of the(54)."
Now modern trains travel across the desert in a very(55)time. One engine can pull as much weight as 135,000(56), In addition, trains use special cars for their load. Refrigerator cars carry food; boxcars carry heavy goods, stock cars carry animals; and tank cars carry oil.
Air travel has changed, too. The earliest planes were biplanes (双翼飞机), with(57)sets of wings. The top speed of this plane was 60 miles per hour. The pilots used to sit or lie on the wings in the. open air. The plane(58)sometimes Stopped in the middle of a trip. it used to be(59)to fly in bad weather. In snow or in rain, the wings frequently became icy. Then the plane might go down.
Mechanical improvements during the First World War changed airplanes. Monoplanes(单翼飞机) took the(60)of biplanes. Pilots flew inside of covered cabins. Still, even these planes were small and expensive. Only(61)people were be able to travel in airplanes.
Now modern jets make air travel possible for all people. No place in the world is more than 24 hours away by jet. Further improvements have(62)the cost of flying, and they have made air travel(63)safer than it used to be. A modern 707 can carry 170 people and can fly at 600 miles per hour. People(64)used to eat, sleep, or watch movies on airplanes.(65)these things are a normal part of air travel!
选项
A、ought
B、added
C、used
D、led
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/IqQd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
ThescientistandagriculturalinnovatorGeorgeWashingtonCarveraidedtheeconomyoftheSouthbydevelopinghundredsofcomme
AtheycanfindthebeststudentsBtheuniversity’sacademicadvancementandphysicalextensionCsomeofthemostdistinguishe
Foryoungchildren,gettingdressedisacomplicatedbusiness.
TeachingandLearningMedicineAwardTwoscientistswhohavewonpraiseforresearchintothegrowthofcancercellscouldb
TeachingandLearningMedicineAwardTwoscientistswhohavewonpraiseforresearchintothegrowthofcancercellscouldb
15MillionAmericansSufferfromSocialAnxietyDisorderSocialanxietydisorderpreventssome15millionAmericansfromle
Thesefactorsinteractintimatelyandcannotbeseparated.
AGoalsBHistoryofWomen’sRightsMovementCStartofWomen’sRightsMovementDTraditionalStatusofWomenERightsofW
AGoalsBHistoryofWomen’sRightsMovementCStartofWomen’sRightsMovementDTraditionalStatusofWomenERightsofW
PleaseFastenYourSeatbeltsSevereturbulence(湍流)cankillaircraftpassengers.Now,intestflightsovertheRockyMountains;
随机试题
可以对同一应用程序建立多个快捷方式。()
颅面骨骼的发育方式有________、________、________三种。
4,5,8,10,16,19,32,()。
对()的施工程序安排,既要考虑生产时为企业服务,又要考虑在基建施工时为施工服务的可能性。
下列关于工程建设标准的说法,正确的是()。
社会主义市场经济的特殊性表现在()。
在讲述《变迁中的家园》一课时,王老师安排学生实地去了解家乡的历史、家园的变迁,用文字和图片的形式来展示其变化,从而调动学生的情绪,激起他们热爱家乡的情感,并产生用自己的笔来描绘家乡自然风光的冲动。在此,王老师运用了()。
党内的是非问题,要按照党章的规定去解决。特殊情况下,经严格的批准手续,允许把对付犯罪的手段用于解决党内的矛盾问题。()
双耳分听实验多被研究者应用在()研究中。
关于RSA算法的叙述不正确的是(5)。
最新回复
(
0
)