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
75
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 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
D
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3375788.html
相关试题推荐
[originaltext]Somepeoplecangetmotionsicknessfrombeinginmovingvehicles
[originaltext]TheWorldSantaClausCongressisdesignedforpeoplewhoenjo
[originaltext](3)TheWorldBankhaswarnedthat100millionmorepeoplewil
[originaltext]Indiaishometomorethan1.2billionpeopleandsecondonly
[originaltext](1)Atleast31peoplehavebeenkilledanddozensmoreinjuredin
[originaltext](1)Roadtrafficcrasheskill1.25millionpeopleeachyearwo
[originaltext](1)Roadtrafficcrasheskill1.25millionpeopleeachyearwo
[originaltext]ThePrimeMinisterofSamoasays77peoplewerekilledand150
[originaltext]ThePrimeMinisterofSamoasays77peoplewerekilledand150
[originaltext]ThePrimeMinisterofSamoasays77peoplewerekilledand15
随机试题
Thirtyyearsago,whenChristianBoerwasfirstlearninghowtoreadwhilegr
WhichgameswillbemovedtoChinabyNBAin2004?[br][originaltext]All
Iknowhewouldbethelastmantoacceptbribes.A、我知道他是最后一个受贿赂的人。B、我知道他决不会接受贿赂
Theholidaysareatimeforeating:piesatThanksgiving,chocolatesforAdv
Adecadeago,theideathattheplanetwaswarmingupasaresultofhumana
某分部工程双代号网络计划如下图所示,图中的错误有() A.多个起点节点
下列各项中属于行政处罚中财产罚的是()A.警告 B.罚款 C
HebrokethewindowinhisangerA:despai
痛经治疗的原则是()。A.以心理治疗为主 B.以对症冶疗为主 C.以促进排
能开郁醒脾的药物是A.陈皮 B.青皮 C.枳实 D.柿蒂 E.甘松
最新回复
(
0
)