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
2024-01-19
70
管理
问题
We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for the North Pole (北极)-we know that it is not only a dangerously cold place, but that people like you and me 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 had been traveling 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, this is not true about landings in the polar region (which passenger planes do not make), 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 more above the earth you can always be sure that you will not see a cloud in the sky as far as the eye can reach. In the tropics (热带), 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.
Planes can’t climb as high or as quickly in cold air as in warm air. Nor can clouds. (18) In practice, this is an advantage to the plane, which is already at a good height when it reaches the polar region and so does not need to climb, while at the same time cold air keeps the clouds down low. [br] Planes 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
转载请注明原文地址:https://tihaiku.com/zcyy/3375787.html
相关试题推荐
[originaltext]Somepeoplecangetmotionsicknessfrombeinginmovingvehicles
[originaltext]TheWorldSantaClausCongressisdesignedforpeoplewhoenjo
[originaltext](3)TheWorldBankhaswarnedthat100millionmorepeoplewil
[originaltext](3)TheWorldBankhaswarnedthat100millionmorepeoplewil
[originaltext]Indiaishometomorethan1.2billionpeopleandsecondonly
[originaltext](1)Atleast31peoplehavebeenkilledanddozensmoreinjuredin
[originaltext](1)Atleast31peoplehavebeenkilledanddozensmoreinjuredin
[originaltext](1)Roadtrafficcrasheskill1.25millionpeopleeachyearwo
[originaltext]ThePrimeMinisterofSamoasays77peoplewerekilledand150
[originaltext]ThePrimeMinisterofSamoasays77peoplewerekilledand15
随机试题
WheredidMadonnahavetheridingaccident?[br][originaltext]Madonna,th
A.publishedB.demonstrateC.cutoffD.studiedE.investigatedF.sta
[audioFiles]audio_eusm_0101(20106)[/audioFiles]A、London.B、EastColchester.C、I
ThecolonyVirginiawasnamedafter_______.A、QueenElizabethB、QueenBloodMarr
[originaltext]Therecentincreaseincarstealinghasalarmedthepolicewho
《标准化法》将标准划分为四级,分别是()。A.国家标准 B.行业标准 C.
下列关于山茱萸的叙述错误的是A.归肝、肾、肺、脾经 B.性微温、味酸、涩 C
A.回流法B.渗漉法C.浸渍法D.水蒸气蒸馏法E.煎煮法可以同时得到药材中挥发性
在住宅项目价格制定过程中,合理的( )是确保价格实现的关键。A.市场调研 B
禁止在机器转动时,从联轴器(靠背轮)和齿轮上取下防护罩或其他防护设备。
最新回复
(
0
)