首页
登录
职称英语
We all know that it is possible for ordinary people to make their homes on t
We all know that it is possible for ordinary people to make their homes on t
游客
2025-03-05
9
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 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 trave lling across and around the equator on wheels, on their feet or in ships for thousands of years: but only a few men, with grea tdiff icul ty 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(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.
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
判断推理题,文中最后一句话说冷空气使云层也降低了,也就是说在高空是没有云的,所以选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3984027.html
相关试题推荐
ThewaypeopleintheUStraveltoandfromworkhaschangedalotinthela
ThewaypeopleintheUStraveltoandfromworkhaschangedalotinthela
ThewaypeopleintheUStraveltoandfromworkhaschangedalotinthela
Oneofthebestwaysforpeopletokeepfitisto______healthyeatinghabits.A、g
Fromherepeoplecanseethebridge______construction.A、belowB、byC、underD、on
Today,manypeoplearestarvingtodeath.Thereisashortageoffoodandth
Today,manypeoplearestarvingtodeath.Thereisashortageoffoodandth
Today,manypeoplearestarvingtodeath.Thereisashortageoffoodandth
Today,manypeoplearestarvingtodeath.Thereisashortageoffoodandth
Today,thereisnosuchthingasa"typical"collegestudent.Peopleofall
随机试题
WhereistheHighlandsinU.K.?A、InWales.B、InScotland.C、InEngland.D、InN
WildpigsarefierceandcourageousfightersandmaychargewithlittleornoA、p
[originaltext]Welcome,sir.Wouldyoumindsigningyournamehere?[/originaltex
Ascientistoncesaidthatstudyingthestarsfromtheearthis【C1】______lo
在接触石棉粉尘与肺癌关系的前瞻性队列研究中,最初的研究对象有一部分后来失访了,这
下列代谢物中,含高能磷酸键的是()。A.3-磷酸甘油醛 B.1,3-二磷酸甘
男,23岁,高处坠落伤,右侧臀部着地,疼痛伴运动障碍并有休克表现首先考虑的诊断是
根据《民法通则》的规定,人身权主要包括()。A:生命健康权B:肖像权C:债权
男性,55岁。双下肢无力半年,右侧明显,近2个月行走不稳,右手不能扣纽扣,无外伤
关于风险的概念,理解不正确的是()A:风险是一个事前概念B:风险是未来结果出现
最新回复
(
0
)