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
2024-01-14
66
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 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, 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
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/3361583.html
相关试题推荐
Youngpeopleareredefiningforthemselves______itmeanstobeamanorawoman.
Veryfewpeopleunderstoodhislecture,thesubjectof______washard.A、whatB、it
Bythetimethewar______,mostofthepeoplehadalreadyleft.A、brokeoutB、bro
Fiftyyearsago,wealthypeoplelikedhuntingwildanimalsforfun______sightsee
Iftapwaterwereasdangerousassomepeoplethink,______wouldbegettingsick
Increasingly,overthepasttenyears,people—especiallyyoungpeople—havebe
Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkabl
Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkabl
Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkabl
Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkabl
随机试题
Fiftyvolunteerswerealphabeticallydividedintotwoequalgroups,GroupA
Whensomebodycalls,firstofall,thehostwouldofferhimacigaretteand
TopicLiveaLowCarbonLifeForthispart,youareallowed30minutesto
AwomaninGuangzhouwasbittenbyherpetafterataxistruckthedogata
大熊猫是中国的国宝,是和平的象征。大熊猫也是一种世界濒危物种,极易受人类活动的影响。由于栖息地(habitat)遭到了破坏,它们的数量正在急剧下降。在中
AFP最常用于哪种卵巢肿瘤的诊断A.晚期上皮癌 B.原发绒癌 C.畸胎瘤
在证券投资基金运作的三大部分中,处于核心作用的是(),其他活动都围绕和服务于这
信用利差是用以向投资者()的、高于无风险利率的利差。A:补偿利率波动风险 B
根据《建筑安装工程费用项目组成》(建标【2013】44号),应计入措施项目费的有
以下关于银行贷款损失准备金的提取,表述错误的是( )。A.普通准备金是用来弥补
最新回复
(
0
)