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
2025-03-06
11
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://tihaiku.com/zcyy/3985857.html
相关试题推荐
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Doyouknowinsurance(保险)?Buyinginsuranceisameansbywhichpeoplecanp
Notalways()theywantto.A、peoplecandowhatB、peoplecannotdowhatC、canpeo
Heabandonedacareerthat()tohisbecomingoneofthemostinfluentialpeople
Doyouknowinsurance(保险)?Buyinginsuranceisa【C1】______bywhichpeopleca
Doyouknowinsurance(保险)?Buyinginsuranceisa【C1】______bywhichpeopleca
Doyouknowinsurance(保险)?Buyinginsuranceisa【C1】______bywhichpeopleca
Doyouknowinsurance(保险)?Buyinginsuranceisa【C1】______bywhichpeopleca
Doyouknowinsurance(保险)?Buyinginsuranceisa【C1】______bywhichpeopleca
随机试题
SexisminEnglishSexisminEnglishlanguagereflectsthetraditionalethicsth
(1)Josephwasanelderly,nay,anoldman:veryold,perhaps,thoughhalean
HowwouldsomeEasternAsiansstarttheirconversationwhentheymeetforthefi
C九宫格对角线上的月亮缺口向左,其余月亮缺口向右,黑、白星星的个数均等。
下边四个小图形中,只有一个是由上边的四个图形拼合而成(只能通过上,下,左,右平移
接收“110”报警是一项公安专业工作。( )
纳税人支付下列款项取得的增值税普通发票或增值税电子普通发票,发票税率栏填写为“不
(2016年真题)在其他条件一定的情况下,有助于强化人们当前的高等教育投资动机的
下列有关回函中免责条款或限制条款的说法中,错误的是()。A.格式化的免责条
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)