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
65
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
Whatisthemostappropriatetitleforthispassage?[br][originaltext]Sto
现场粘贴饰面砖粘结强度检验应以每10OOm2同类墙体饰面砖为一个(),不足10
下列有关自动喷水灭火系统设计的说法中,哪几项正确?( )A.宾馆客房可采用边墙
下列不属于慢性病定义的是A.一旦发病不能自愈 B.很难药物治愈 C.用生活方
关于视器的说法中,何者正确()A.眼球前、后极的连线叫眼轴 B.角膜无色
甲公司利用机密级测绘成果开发的产品,未经省级测绘地理信息主管部门进行保密技术处理
马克思说:“蜘蛛的活动与织工的活动相似,蜜蜂建筑蜂房的本领使人间的许多建筑师感到
“十一五”时期,加快我国油气基地建设应遵循的原则是() A.稳定东部、发
关于内支撑体系的施工的说法,正确的是( )。A.内支撑结构的施工与拆除顺序应与
(2019年真题)施工测量是一项琐碎而细致的工作,作业人员应遵循()的原则开展
最新回复
(
0
)