首页
登录
职称英语
We all know that it is possible for ordinary people to make their homes on th
We all know that it is possible for ordinary people to make their homes on th
游客
2025-02-28
18
管理
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. [br] Aeroplanes usually do not need to climb quickly or fly high in the polar region because______.
选项
A、they do not land there
B、there are no clouds at all
C、they can cross the ice with special equipment
D、it is very cold
答案
B
解析
根据文章最后一句可知,冷空气使云层也降低了,也就是说在极地高空是没有云的。故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3976145.html
相关试题推荐
Increasingly,overthepasttenyears,people—especiallyyoungpeople—haveb
Notalways______theywantto.A、peoplecandowhatB、peoplecannotdowhatC、ca
Itisimpossibletoliveinsocietyandbeindependent______society.A、onB、fro
—Isthereanypossiblewaytohelpthemgetridofsuchabadhabit?—Totellth
Sheisvery______toringmetonight.Icansensethat.A、liableB、possibleC、li
Heissuchamanwhoisalways______faultwithotherpeople.A、puttingB、seekin
ThepeopleatthepartywereworriedaboutJanetbecausenoonewasaware______s
Ican’t______himtothosepeople;Idon’tthinkheknowsthematall.A、joinB、l
Duringthelastthreedecades,thenumberofpeopleparticipatinginphysicalfi
______wasonceregardedasimpossiblehasnowbecomeareality.A、WhatB、ThatC、
随机试题
Asweknow,smokingnotonlygivesharmtosmokers,butalsotonon-smokerswho
Ioncefoundoutthatdoingafavorforsomeonecouldgetyouintotrouble.
Thispassageismostprobablywrittenas______.[br]Whichofthefollowingtop
根据站用直流电源系统验收细则,两组蓄电池的变电站直流母线应采用()运行的方式
下列对作家作品的解说中不正确的一项是( )A.在我国古代文学史上,有许多名家常
某关爱中心配合有关部门,为辖区内的低保家庭开展专业社会工作服务。该中心为这些家庭
首次公开发行股票并在创业板上市的发行人应当在招股说明书显要位置作如下提示:“本次
远志的药理作用有()A.抗菌 B.祛痰 C.抗惊厥 D.保肝 E.降血
不加热,提取比较完全,但费时、消耗溶剂量大的方法是A.浸渍法 B.渗漉法 C
洗必泰溶液为口内手术后常用的含漱液,它的浓度是A.0.01%~O.03% B.
最新回复
(
0
)