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
2025-03-07
61
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/3986305.html
相关试题推荐
Todayanyonewillacceptmoneyinexchangeforgoodsandservices.Peopleus
Todayanyonewillacceptmoneyinexchangeforgoodsandservices.Peopleus
Todayanyonewillacceptmoneyinexchangeforgoodsandservices.Peopleus
Whenwewantto【C1】______otherpeoplewhatwethink,wecandoitnotonlyw
Whenwewantto【C1】______otherpeoplewhatwethink,wecandoitnotonlyw
Whenwewantto【C1】______otherpeoplewhatwethink,wecandoitnotonlyw
Whenwewantto【C1】______otherpeoplewhatwethink,wecandoitnotonlyw
Whenwewantto【C1】______otherpeoplewhatwethink,wecandoitnotonlyw
Fiftyyearsago,wealthypeoplelikedhuntingwildanimalsforfun______sightsee
Extensivenewstudiessuggestthattheworldhasmadeextraordinaryprogress
随机试题
Resourcescanbesaidtobescarceinbothanabsoluteandrelativesense;t
A
抗肿瘤药物引起的口腔黏膜反应的处理措施不包括()A:真菌感染应用制霉素液(10
资本利润率指的是商业银行在一个会计年度内获得的税后利润与总资产平均余额的比率。(
A.乙琥胺 B.地西泮 C.丙戊酸 D.苯妥英钠 E.卡马西平对失神小发
Thescientistsareexploringtheareain
关于结肠癌术前肠道准备的叙述,正确的是()。A.术前3天禁食 B.术前3天每
甲企业位于B地区,主要生产A产品。某咨询公司接受甲企业的委托,完成了下列咨询服务
在快硬硅酸盐水泥的使用过程中,如果对于水泥的质量问题存在怀疑或者出厂日期超过()
因医疗机构的行为造成患者损害,应当承担侵权责任的情形是( )。A.限于当时医疗
最新回复
(
0
)