首页
登录
职称英语
We all know that it is possible for ordinary people to make their homes o
We all know that it is possible for ordinary people to make their homes o
游客
2024-01-14
23
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 travelling 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 need 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/3361271.html
相关试题推荐
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Firecanhelppeopleinmanyways.Butitcanbeverydangerous.Firecanhe
Firecanhelppeopleinmanyways.Butitcanbeverydangerous.Firecanhe
Increasingly,overthepasttenyears,people—especiallyyoungpeople—haveb
Increasingly,overthepasttenyears,people—especiallyyoungpeople—haveb
Increasingly,overthepasttenyears,people—especiallyyoungpeople—haveb
Peopleliveingroups,whichwecallsocieties,andsocialrelationsarethe
随机试题
[originaltext]W:Haveyoutraveledmuch?M:Well,I’vebeenaroundtheworldse
[originaltext]W:ImusthavetoldMikefivetimesnottoforgetthemeeting.An
Inthesentence"Fatheraskedustopicksomeapplesonthefarm",theunderline
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
30yearsago,anyoneblaminglonelinessforphysicalillnesswouldhavebeen
根据行政处罚法的规定,下列各项中,可以设定吊销企业营业执照处罚的有:A:法律
简要谈谈数学教学方法的选择依据的因素有哪些
共用题干 PhelpsWantstoEnjoyLifeAfterO
下列各句中没有使用比喻修辞手法的一句是: A改革是火种,点燃了中国人的心灵之火
因业务发展需要,我国的A公司总部以融资租赁的方式购置一批市场设备。目前有甲、乙两
最新回复
(
0
)