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
We all know that it is possible for ordinary people to make their homes on the equator, although often they may feel uncomfortab
We all know that it is possible for ordinary people to make their homes on the equator, although often they may feel uncomfortab
admin
2018-04-04
60
问题
We all know that it is possible for ordinary people to make their homes on the equator, although often they may feel uncomfortably hot there. Millions do it. But as for the North Pole—we know that it is not only a dangerously cold place, but that people like you and I would find it quite impossible to live there. At the present time only the scientists and explorers can do so, and they use special equipment. Men have been travelling across and around the equator on wheels, on their feet or in ships for thousands of years; but only a few men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. So it may surprise you to learn that, when traveling by air, it is really safer to fly over the North Pole than over the equator. Of course, it is not true about landings in the polar region, but the weather, if we are flying at a height of 5,000 meters above the Pole is a delight. At 4,000 meters and move above the earth you can always be sure that you will not see a cloud in the sky as far as your eyes can reach. In the tropics, on the other hand, you are not certain to keep clear of bad weather even at such heights as 18,000 or 20,000 meters.
Aeroplanes can’t climb as high or as quickly in cold air as in warm. Nor can clouds. In practice , this is an advantage to the aeroplane, which is already at a good height when it reaches the polar region and so does not to climb, while at the same time cold air keeps the clouds down low.
Aeroplanes can climb quickly______.
选项
A、in warm air
B、in cold air
C、when it reaches the polar region
D、only when the clouds are down low
答案
A
解析
根据文章第二段第一句“Aeroplanes can’t climb as high or as quickly in cold air as in warm.”可知,飞机在冷空气里不如在热空气里飞的高和快。故选A。
转载请注明原文地址:https://kaotiyun.com/show/ylCO777K
0
成人本科学位英语
相关试题推荐
Improvementsofallkinds______intelevisionsothatreceptionwillbeasclosetoperfectaspossible.
Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsareformed.Itisnoteasytoexplainwhyoneperson
Evenachildknowsthatnoddingheadmeans"Yes".ButsomepeopleWouldprobably(56)whentheyfirstcametoIndia.Whenthey
Manyadelegatewasinfavorofhisproposalthataspecialcommittee________toinvestigatetheincident.
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopic"OnFriendship".Youshouldwriteatleast120
随机试题
A.血pH值下降CO2CP上升B.血pH值下降CO2CP下降C.血pH值上升CO2CP上升D.血pH值上升CO2CP下降E.血pH值不变CO2CP稍上升代谢性酸中毒为
患者关节疼痛重着,四肢酸困沉重,头重如裹,其病因是
片剂中常加入硬脂酸镁作润滑剂,其中的镁离子干扰配位滴定法,消除的方法有
工程高程控制测量过程中,精度最高的是()。
下列属于不征和免征土地增值税的有()。
教师通过对自己的教学进行自我观察、自我监控、自我调节、自我评价后提出一系列问题,以促进自身反思能力提高的方法属于()。
中国近代意义上第一部法院编制法是()
设A=E-ξξT,其中层为n阶单位矩阵,ξ是n维非零列向量,ξT是ξ的转置.证明:当ξTξ=1时,A是不可逆矩阵.
NaturalMedicinesSinceearliestdays,humanshaveusedsomekindsofmedicines.Weknowthisbecausehumanshavesurvived.An
A、Theirlifestyleandculture.B、Theirmoodandcondition.C、Thediningenvironment.D、Theamountofworkingtime.A题干询问影响美国人食物选
最新回复
(
0
)