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
19
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 can climb quickly( ).
选项
A、in warm air
B、in cold air
C、when it reaches the polar region
D、only when the clouds are down low
答案
A
解析
事实细节题。第二段第一句话可知,飞机在冷空气里不如在热空气里飞的高和快。所以选A。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3984026.html
相关试题推荐
ThewaypeopleintheUStraveltoandfromworkhaschangedalotinthela
Hislittlecarisn’t______forfivepeople.A、enoughbigB、bigenoughC、asenough
Oneofthebestwaysforpeopletokeepfitisto______healthyeatinghabits.A、g
Itismoredifficult______peoplewhoarenaturallyshy______becomeeffectivepub
Today,manypeoplearestarvingtodeath.Thereisashortageoffoodandth
Today,manypeoplearestarvingtodeath.Thereisashortageoffoodandth
Today,thereisnosuchthingasa"typical"collegestudent.Peopleofall
Today,thereisnosuchthingasa"typical"collegestudent.Peopleofall
Today,thereisnosuchthingasa"typical"collegestudent.Peopleofall
Today,thereisnosuchthingasa"typical"collegestudent.Peopleofall
随机试题
WhatdoesthegatheringnearWashingtonDCmainlydiscuss?[originaltext](7
AmandaandStevebothgotnewjobslastweekandtheyarebacktomeetoldcolle
下列疾病中,不宜行直肠指诊的是A.直肠肿瘤 B.肛瘘 C.肛裂 D.直肠脱
A. B. C. D.
下列选项中,一般不属于商业票据的主要投资者的是()。A.商业银行 B.证
无风险收益率和市场期望收益率分别是0.06利0.12。根措CAPM模型,贝塔值为
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
不属于苯二氮类的药物是A.氯氮 B.氟西泮 C.奥沙西泮 D.三唑仑 E
下列关于内部劳动力市场的说法中,正确的有( )。A.它是指在大型组织内部存在的
下列耐火材料中,属于中性耐火材料是( )。A.高铝砖 B.镁铝砖 C.硅砖
最新回复
(
0
)