首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
All over the earth’s surface is a layer of air which extends upwards for many miles. This air (1)_____ the oxygen without which
All over the earth’s surface is a layer of air which extends upwards for many miles. This air (1)_____ the oxygen without which
admin
2009-04-27
49
问题
All over the earth’s surface is a layer of air which extends upwards for many miles. This air (1)_____ the oxygen without which neither plants nor animals (2)_____ live. Its movements, temperature and pressure (3)_____ the weather, and it is a vehicle (4)_____ the clouds of water vapor (5)_____ condense and fall as rain. It forms a blanket which (6)_____ us from the extreme heat of the sun during the day and (7)_____ the extreme cold when the sun has (8)_____
It is chiefly (9)_____ air that sound travels, so that if there were no air we should (10)_____ practically nothing. The atmosphere is held (11)_____ the earth’s surface by the gravitational pull of the earth—that is, it has weight. High up it is thin (12)_____ near the surface it is compressed by the (13)_____ of air above, and is more dense. The weight of air pressing (14)_____ each square inch of surface at sea-level is nearly (15)_____ pounds, which means that the total force (16)_____ the skin of an average man is about 30,000 pounds. He is not, (17)_____ this because the pressure is equal in all directions and the pressure inside him is equal (18)_____ -that without, but should he go up in a balloon to a height at which the outside- pressure is (19)_____ he would suffer acutely. It is (20)_____ this reason that the cabins of aeroplanes are ’pressurized’.
选项
A、for
B、since
C、because
D、but
答案
D
解析
该句意为,在高空空气很稀薄,但靠近地球表面的空气被上面的空气重量压迫,密度较高。
转载请注明原文地址:https://kaotiyun.com/show/zCa4777K
0
考研英语一
相关试题推荐
Howbesttosolvethepollutionproblemsofacitysunksodeepwithinsulfurouscloudsthatitwasdescribedashellonearth?
Despitethetemptationforparentstosayyestotheirchildren’swishes,researchshowsthere’saninsidioussidetochasing
Despitethetemptationforparentstosayyestotheirchildren’swishes,researchshowsthere’saninsidioussidetochasing
Joyandsadnessareexperiencedbypeopleinallculturesaroundtheworld,buthowcanwetellwhenotherpeoplearehappyord
TherearemanyreasonsforthesorrystateofcommercialaviationinAmerica.ButIcometoyouasatechnologycolumnisttotel
[A]FewerchildrenattendCatholicschoolsnow[B]Changeinhigher-incomefamilieswillleadtochangeofprivateschoolpo
Onthesurface,Marsisthepictureofdesolation.Abarrenlandremains【C1】______forhundredsofmillionsofyears,motionless【
Onthesurface,Marsisthepictureofdesolation.Abarrenlandremains【C1】______forhundredsofmillionsofyears,motionless【
[A]Sticktoyourinvestmentplan[B]Maintainliquidity[C]Focusontheannualratereturn[D]Acceptnormalmarketi
Manisbornfreebutiseverywhereindebt.Intherichworld,gettingholdofyourfirstcreditcardisariteofpassagefarm
随机试题
“气凝胶”是一个不断发展的概念,早期提及气凝胶,更多强调它是一种由湿凝胶去除溶剂之后得到具有纳米孔的多孔材料。但是后来出现的新型气凝胶,有一部分并不满足纳米孔的特点,甚至还有的气凝胶是由气相法制备的。气凝胶最传统的制备方法是利用有机醇盐等前驱体的水解聚合反
柱形锪钻外圆上的切削刃为主切削刃,起主要切削作用。( )
不影响肺弥散量的因素是
类风湿关节炎除关节受损外还有关节外病变,主要是
患者,男,34岁,症见身热夜甚,心烦谵语,斑疹隐隐,口渴,舌绛少苔,脉细数者。治宜选用
甲为年满22周岁的青年工人,乙为年满15周岁的精神病人(限制行为能力人)。一日乙之父正与甲聊天,甲问乙是否敢拿一块石头砸丙,乙便捡起一块石头向丙扔去,将丙砸伤,对此乙之父未予阻止,花去医药费2000元。对此损失,应由:()
国家助学贷款首次还款日应不迟于毕业后()年。
下列关于政策性银行的说法错误的是()。
美国各门课程中多样化的实践活动,日本的综合活动时间反映出对_____在课程中地位的重视。【】
[*]
最新回复
(
0
)