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
Rockets in the Sky If someone asked you, "What color is the sky?" I expect that you would answer, "Blue. " I am afraid that
Rockets in the Sky If someone asked you, "What color is the sky?" I expect that you would answer, "Blue. " I am afraid that
admin
2014-03-13
44
问题
Rockets in the Sky
If someone asked you, "What color is the sky?" I expect that you would answer, "Blue. " I am afraid that you would be wrong. The sky has no color. When we see blue, we are looking at blue sunlight. The sunlight is shining on little bits of dust in the air.
We know that there is air all around the world. We could not breathe without air. Airplanes could not fly without air. They need air to lift their wings. Airplanes cannot fly very high because as they go higher the air gets thinner. If we go far enough away from the earth, we find there is no air.
What is the sky? The sky is space. In this space there is nothing except the sun, the moon and all the stars.
Scientists have always wanted to know more about the other worlds in the space. They have looked at them through telescopes and in this way they have found out a great deal. The moon is about 384, 000 kilometers away from the earth. An airplane cann’ t fly to the moon but there is a thing that can fly even when there is no air. This is rocket.
I am sure that you are asking, "How does a rocket fly?" If you want to know, get a balloon and then blow it up until it is quite big. Do not tie up the neck of the balloon. Let go! The balloon will fly off through the air very quickly. The air inside the balloon tries to get out. It rushes out through the neck of the balloon and this pushes the balloon through the air. It does not need wings like an airplane.
This is how a rocket works. It is not made of rubber(橡胶)like a balloon, of course. It is made of metal. The metal must not be heavy but it must be very strong. There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket, the rocket is pushed up into the air.
Rockets can fly far out into space. Rockets with men inside them have already reached the moon. Several rockets, without men inside them, have been sent to other worlds much farther away. One day rockets may be able to go anywhere in the space.
A rocket is pushed up into the air when______.
选项
A、hot gas rushes out of its head
B、it is powered by gas
C、hot gas rushes out of its bottom
D、hot gas rushes out of its neck
答案
C
解析
根据第六段最后一句可知,当热气从火箭尾部冲出时,火箭被送入空中。C项中的“itsbottom”是第六段最后一句中的“the end of the rocket”的同义转换。
转载请注明原文地址:https://kaotiyun.com/show/woGd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
DriedFoodsCenturiesago,mandiscoveredthatremovingmoisture(51)foodhelpedtopreserveit,andthattheeasiestwaytodot
DriedFoodsCenturiesago,mandiscoveredthatremovingmoisture(51)foodhelpedtopreserveit,andthattheeasiestwaytodot
ANewfindingabouttheupperatmosphereBStratosphereCIonosphereDThecompositionofthepermanentgasesintheatmosph
A.late18thcenturyB.equaleducationandemploymentwithmenC.weakerandlowerinsocialpositionD.early20thcenturyE.h
A.late18thcenturyB.equaleducationandemploymentwithmenC.weakerandlowerinsocialpositionD.early20thcenturyE.h
PaperorPlastic?TakeawalkalongtheChesapeakeBay,andyouarelikelytoseeplasticbagsfloatinginthewater.Theyh
A.ReasonsforHIVresistanceB.ImplicationsofchimpanzeeextinctionforhumansC.EffectiveAIDstreatmentD.Geneticsimilar
TakingaNapduringtheDayMedicalexpertssaymostAmericansdonotgetenoughsleep.TheysaymoreAmericansneedto【51】
EmploymentOpinionpollsarenowbeginningtoshowanunwillinggeneralagreementthat,whoeveristoblameandwhateverha
A.Adjustmentofyoungpeople’sstyleB.DisadvantageofcollegeeducationC.WhatfasionisD.TheimportanceofcreativityE.Warni
随机试题
布鲁纳是美国教育心理学家,他认为学习的实质是()。
消化性溃疡在活动期最佳的治疗方案是
级数的收敛性是()。[2008年真题]
某公司拟进行股票投资、计划购买A、B、C三种股票,并分别设计了甲、乙两种投资组合。已知三种股票的β系数为1.5、1.0和0.5,它们在甲种投资组合下的投资比例为50%、30%和20%;乙种投资组合的风险收益率为3.6%。同期市场上所有股票的平均收益率为10
把实物、教具呈现给学生观察,或通过示范性地实验来说明和印证要求学生掌握知识的一种方法是()。
甲、乙、丙三人分276只贝壳,甲每取走5只,乙就取走4只,乙每取走5只,丙就取走6只。那么,最后乙分到多少只贝壳?
随着我国高中教育大众化、普及化,普通高中的性质发生改变,在教育任务上普通高中要兼顾基础教育和
结合当前我国基础教育课程改革,谈一谈影响课程改革的主要因素。
(1)ThebiggestproblemfacingChileasitpromotesitselfasatouristdestinationtobereckonedwith,isthatitisattheend
A、He’sgoingtosellhishouse.B、He’sgoingtofindanapartment.C、He’sfoundanapartment.D、He’smovedtodowntown.B
最新回复
(
0
)