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
2024-01-17
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 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(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 mere
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/3369511.html
相关试题推荐
ThepeopleatthepartywereworriedaboutJanetbecausenoonewasaware()she
Toooftenyoungpeoplegetthemselvesemployedquitebyaccident,notknowin
Toooftenyoungpeoplegetthemselvesemployedquitebyaccident,notknowin
Toooftenyoungpeoplegetthemselvesemployedquitebyaccident,notknowin
Weallknowthatitispossibleforordinarypeopletomaketheirhomesont
Weallknowthatitispossibleforordinarypeopletomaketheirhomesont
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
随机试题
以下关于解释方式下运行程序的叙述中,错误的是()。A.先将高级语言程序转换为
Manycomputerlanguagesprovideamechan
不属于业务管理机构的职能部门是:()A.保卫处 B.医务处 C.护理
在一定缓冲比范围内,缓冲溶液才具有缓冲能力,其对应的pH范围为缓冲范围,缓冲范围
Whatcanbedoneaboutmassunemployment
材料配置计划确定依据是()。A、施工进度计划 B、资金计划 C、施工工法
旅游乘数效应的大小与( )成正方向变化。A.边际储蓄倾向 B.边际消费倾向
劳动保障监察的首要原则是()A.公正、公开原则 B.高效、便民原则 C.保
卖出看跌期权可以应用在下列哪些场景中?( )A.赚取期权价差收益 B.获取权利
患者,男,22岁,因刷牙出血,牙齿松动半年就诊。无全身疾病。牙周龈上、龈下洁治后
最新回复
(
0
)