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
外语
What makes shipwreck diving appealing is also what makes it so dangerous. Wrecks, for example, can sink to extreme depths. The A
What makes shipwreck diving appealing is also what makes it so dangerous. Wrecks, for example, can sink to extreme depths. The A
admin
2010-10-14
34
问题
What makes shipwreck diving appealing is also what makes it so dangerous. Wrecks, for example, can sink to extreme depths. The Andrea Doria is known as the "Mt. Everest of diving" partly because it’s an intimidating 180 feet below the water’s surface. And that’s only to the top of the wreck.
At such depths, breathing gets very complicated. Unlike on Everest, where oxygen levels are thin, the weight of water at more than 20 feet deep compresses the oxygen that divers breathe. That oxygen density, in turn, wreaks havoc(破坏)on the human nervous system and can lead to unconsciousness and eventually death.
Nitrogen also takes on deadly traits underwater. Again, the weight of water is about 64 pounds per cubic foot is what transforms this otherwise harmless gas. As a diver plunges deeper underwater, excess nitrogen is compressed in the bloodstream. If divers rise too fast to the surface, the compressed nitrogen expands and can fizz out of the bloodstream, entering the spinal column and causing an extremely painful and sometimes deadly condition known as the bends.
Nitrogen’s other underwater effect is a little more pleasant, but equally lethal. It is called the whiskey factor, at every 50 feet of depth it’s like taking a shot of whiskey. While an alcoholic buzz may be an appealing sensation on land, losing your senses underwater can lead to fatal accidents. And shipwrecks hold plenty of potential for accidents. Underwater wrecks are nothing more than a tangle of lines and rotting structures that present a deadly maze(迷宫)to divers.
One device divers use to avoid getting snared or disoriented in a wreck is a guideline, or coiled string, that they tie along their path. Like a trail of breadcrumbs, the guidelines allow them to retrace their route. Despite such precautions, the captivating(迷人的)underwater world of a shipwreck can make even the best divers lose focus.
Equipment in the sport as a whole has also seen great advances in recent years. In the late 1980s introduced wristwatch-sized diving computers that tell divers when it’s time to surface and at what rate, better dry suits that keep the body warmer at chilled depths and mixed gasses that replaced compressed air to make the sport less risky.
The difference between mountain climbing and shipwreck diving lies in ______.
选项
A、the amount of oxygen
B、the atmospheric pressure
C、the breathing rate
D、the damaging degree of the human nervous system
答案
A
解析
细节理解。从第2段第2句可以看出,登山和潜水的不同在于:登山时氧气逐渐稀薄而潜水时20英尺以下氧气就变得农稠。所以选项A)正确。
转载请注明原文地址:https://jikaoti.com/ti/O1AFFFFM
0
大学英语四级
相关试题推荐
Tosaythatthechildlearnsbyimitationandthatthewaytoteachistosetagoodexampleisabitoversimplified.Nochildi
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
A、Shepulledthecompanythroughextremedifficulties.B、Sheearnedalotofprofitsforthecompany.C、Sheprovedthatwomenar
A、Heshoulddotheexperimentlater.B、Hemustextremelycareful.C、Sheiswillingtodotheexperimentforhim.D、She’ssurehe
A、Trytofinditinthehouse.B、Repairtheroof.C、Lendhisfriendapen.D、Becomeextremelyangry.D女士说把Peter最喜欢的钢笔给弄丢了,男士说如果
随机试题
10个月发育性髋关节脱位轻症患儿的治疗宜采用()
男性,11岁,因牙齿排列不齐要求正畸治疗.检查见前牙拥挤如果拍片时发现颌骨体内边缘清楚的卵圆形致密影,直径2~4mm.与牙根无关.应诊断为
患者四肢不温,口淡不渴,神疲乏力,少气懒言,自汗,食少纳呆。根据中医望诊理论,该患者舌形可能为()。
为了描述城市土地利用的情况,可以采用的空间数据方式为()
一般来说,在偿还贷款时,企业希望采用定期等额偿还方式,而银行希望采用到期一次偿还方式。()
要素禀赋论是对比较优势理论的进一步发展,它由经济学家()提出。
据《礼记.王制》记载,早在中国奴隶社会统治阶级在经济上就已经“量入以为出”,这实际是指财政的()。
转基因食物的安全问题,引起了社会的广泛争议,各方观点对立,难以达成基本的共识,公众面对转基因食品选择时常常________,期待政府规范转基因食品的风险评估和管理。填入划横线部分最恰当的一项是:
外控型人格:认为个人生活中的主导力量是外力。外控型的人常常将许多事情归结为外部的原因,认为人的快乐和痛苦是无法自主的,一切都在他人或是命运的主宰下。根据上述定义,下列体现外控型人格的是()。
InthedescriptionoftwoIndianairlinecompanies,whichstatementsisINCORRECT?
最新回复
(
0
)