首页
登录
职称英语
[originaltext] Men have been traveling across and around the equator on whee
[originaltext] Men have been traveling across and around the equator on whee
游客
2023-07-26
29
管理
问题
Men have 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 airplanes 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, on the other hand, you are not certain to keep clear of had weather even at such heights as 18,000 or 20,000 meters.
Airplanes 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 airplane 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.
选项
A、they do not land there
B、there are not clouds at all
C、they can cross the ice with special equipment
D、it is very cold
答案
B
解析
综合理解题。在北极上空,飞机通常不需要迅速爬高或上升,因为在那一高度,根本就没有云层,同时冷空气也会使云层下落降低,所以B项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2871580.html
相关试题推荐
[originaltext]BushwasbornonJuly6,1946,inNewHaven,Connecticut,the
[originaltext]Well,temperaturesarefinallystaffingtofallinnorthAmer
[originaltext]In1977,ababygirlbecameseriouslyillinQatar,nearSaud
[originaltext]M:Haveyouseenmyglasses?Ican’tfindthemanywhere.W:Goin
[originaltext]M:Haveyouseenmyglasses?Ican’tfindthemanywhere.W:Goin
[originaltext]W:I’mtryingtofindoutbowthisdishwasherworks.Themanuali
[originaltext]W:I’mtryingtofindoutbowthisdishwasherworks.Themanuali
[originaltext]W:I’mtryingtofindoutbowthisdishwasherworks.Themanuali
[originaltext]W:I’mtryingtofindoutbowthisdishwasherworks.Themanuali
[originaltext]W:I’mtryingtofindoutbowthisdishwasherworks.Themanuali
随机试题
Iwasdisappointedthatthehotel____inHongKongdidn’tsupplyfreeaccessto
[originaltext]TheNationalAssociationofCollegesandEmployerscollectsin
Questions27-30Foreachquestion,onlyONEofthechoicesiscorrect.Writethe
[A]affect[B]consistency[C]contrary[D]contribute[E]decrease[F]domi
[originaltext]W:Didn’tyouwriteapaperaboutAlbertKahnlastsemester?M:Y
把路由器当前配置文件存储到NVRAM中的命令是()。A.Router(conf
A.必须无菌 B.细菌菌落总数应≤20cfu/g或≤20cfu/100cm,致
在队列研究中,估计某因素与某疾病关联强度的指标是A、总人群中该病的发病率 B、
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
国际工程施工承包合同争议解决方式中,最常见、最有效、最应该首选的方式是()。A
最新回复
(
0
)