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
59
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 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
根据文章第二段第一句“Aeroplanes can’t climb as high or as quickly in cold air as in warm.”可知,飞机在冷空气里不如在热空气里飞的高和快。故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/3361582.html
相关试题推荐
Thoughsomepeoplehavesuggestedthatwomenshouldreturntohouseworkino
Thereasonwhysomepeopleareunlikelytosucceedinlifeisthatthey______.
Thereasonwhysomepeopleareunlikelytosucceedinlifeisthatthey______.
Thereasonwhysomepeopleareunlikelytosucceedinlifeisthatthey______.
WhatisthemajorfunctionofParagraph1?[br]WhyaresomepeopleagainstTV?A
Firecanhelppeopleinmanyways.Butitcanalsobeverydangerous.Firec
Firecanhelppeopleinmanyways.Butitcanalsobeverydangerous.Firec
Firecanhelppeopleinmanyways.Butitcanalsobeverydangerous.Firec
WhentheterroristattackonSeptember11thcausedpeopletofleethebuildi
WhentheterroristattackonSeptember11thcausedpeopletofleethebuildi
随机试题
Talktoanyparentofastudentwhotookanadventurousgapyear(ayearbe
骨髓增生极度活跃,最常出现于A.正常骨髓象 B.巨幼红细胞性贫血 C.再生障
A.厂矿新工人就业前体检 B.给工人宣讲粉尘的危害与防护 C.新建厂矿职业卫
患者,男,11岁,左右上下颌第一磨牙反,左右上尖牙缺失,上颌后缩,下颌前突,前牙
属于抗心律失常Ⅲ类(延长动作电位时程)药物的是()。A.普罗帕酮 B.美托洛
下列谱例中的节拍属于()。 A.复拍子 B.单拍子 C.散拍子 D.变换
(2016年真题)基金交易确认是()的职责之一。A.基金份额登记机构 B
化脓性脑膜炎腰椎穿刺后让患儿去枕平卧A.2小时 B.5小时 C.6小时 D
投资仍然是拉动中国经济增长的主要动力,但与以前主要靠地方政府利益驱动不同,现在的
假定金融机构的法定准备金率为20%,超额准备金率为2%,现金漏损率为3%,则存款
最新回复
(
0
)