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、They were long and had engines at the back. B、They were round and had engines in the front. C、They were round and had engines
A、They were long and had engines at the back. B、They were round and had engines in the front. C、They were round and had engines
admin
2013-09-09
29
问题
Men have always wanted to fly like birds.(22)Birds can fly easily because they are light, but men’s bodies are heavier.
Men first went up into the air in balloons. These are big bags, and they are filled with gas.(23)Hydrogen is a useful gas for balloons. It is lighter than air. So balloons are usually filled with hydrogen.
Balloons have to fly with the wind, as they have no engines to drive them against it. Later, men made airships. These were balloons with engines, but they were not round.(24)They were long, and the engines were at the back. They were also filled with hydrogen and some of them caught fire, because the hydrogen escaped and the engines heated it. Then the airship was completely burnt in a few seconds. People go across the world by aircraft which have engines similar to but more powerful than those of cars. There is another kind of engine which we call the jet engine. An English engineer invented the jet engine. In May 1941 his new engine was fixed in an aircraft, and the aircraft flew quite well. Jet engines are very powerful. Usually two, three or four are enough for an aeroplane; but some big aircraft have six. Anyone in a moving jet plane can feel the power of the engines.(25)Jet planes can travel faster than sound. As a flying jet plane leaves its noise behind, we do not hear it until it has gone.
选项
A、They were long and had engines at the back.
B、They were round and had engines in the front.
C、They were round and had engines at the back.
D、They were long and had engines in the front.
答案
A
解析
转载请注明原文地址:https://jikaoti.com/ti/xRoFFFFM
0
大学英语四级
相关试题推荐
A、Atemporaryjob.B、Apermanentjob.C、Somemoneyfortheuniversityfees.D、Somemoneyforthevacation.A
A、severalweeks.B、untilyourdoctortellsyou.C、12months.D、atleast6months.C此题考查听细节信息。只要抓住关键词“12months”。
Itispossibletolearnsomethingaboutmusicthroughbriefcontactwithit,butwithoutthebenefitofformalinstruction.Peop
A、It’stoohigh.B、It’sacceptable.C、It’scheapindeed.D、Thewomanshouldhavebargainedforit.CW:Ispent$50onthissofa.
GreenWaveWashesOverMainstreamShoppingResearchinBritainhasshownthat"greenconsumers"continuetoflourishasasi
Intoday’sAmerica,moreandmoreeducatorshaverealizedthatcomputerabilityis【B1】______necessaryforcollegestudents.Many
Therelationshipbetweenhumananddogdatesbacktoatleast8,000yearsago.Differenttypesofdogswere【S1】______fordiffere
A、Toattendabusinessconventionintown.B、Tomeethisclients.C、Toseehisfriend.D、Toprepareforaninterviewofanewjo
A、Forthesakeofhighgrades.B、Forpassinggivenexaminations.C、Forthegoodofgainingknowledge.D、Forthecompletionofre
A、Hehasanotherclassat4:30.B、Hehastogoforapart-timejob.C、Heneedstimetoprepareforit.D、Hehastoattendameet
随机试题
影响行政系统的政治环境包括三个因素,分别是()
阅读《前赤壁赋》中的一段文字,然后回答问题。况吾与子渔樵于江渚之上,侣鱼虾而友麋鹿,驾一叶之扁舟,举匏樽以相属。寄蜉蝣于天地,渺沧海之一粟。哀吾生之须臾,羡长江之无穷。挟飞仙以遨游,抱明月而长终。知不可乎骤得,托遗响于悲风。这段文字突出的艺术
符合甲状腺功能亢进症代谢率增高的表现是
下列有关普萘洛尔的描述错误的是
曹某,45岁,失血性休克,正在进行扩容疗法,中心静脉压监测为0.49kPa(5cmH2O),血压9.3/6.7kPa(70/50mmHg),应( )。【历年考试真题】
室外消火栓按其进水口的公称通径可分为()。
外国人前往不对外国人开放的地区旅行,必须向当地旅游行政管理部门申请旅行证件,由旅游者临时居留地或工作地的市、县旅游行政管理部门办理。()
在东海大学研究生会举办的一次中国象棋比赛中,来自经济学院、管理学院、哲学学院、数学学院和化学学院的5名研究生(每学院1名)相遇在一起。有关甲、乙、丙、丁、戊5名研究生之间的比赛信息满足以下条件:(1)甲仅与2名选手比赛过;(2)化学学院
NeverGiveUp永不言弃Writeanessayof160-200wordsbasedonthedrawing.Inyouressay,youshould1)describethedrawingbriefl
Wheredidthemanleavehisglasses?
最新回复
(
0
)