2006年考试新辅导之托福写作题库新增试题十三(1)
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Question 20-28

Under certain circumstance the human body must cope with gases at greater-than-normal atmospheric1 pressure.For example,gas pressures increase rapidly during a dive made with scuba2 gear because the breathing equipment allows divers3 to stay underwater longer and dive deeper.The pressure exerted on the human body increases by 1atmosphere for every 10meters of depth in seawater,so that at 30meters in seawater a diver is exposed to a pressure of about 4atmospheres.The pressure of the gases being breathed must equal the external pressure applied4 to the body;otherwise breathing is very difficult.Therefore all of the gases in the air breathed by a scuba diver at 40meters are present at five times their usual pressure.Nitrogen which composes 80percent of the air we breathe usually causes a balmy feeling of well-being5 at this pressure.At a depth of 5atmospheres nitrogen causes symptoms resembling alcohol intoxication6 known as nitrogen narcosis.Nitrogen narcosis apparently7 results from a direct effect on the brain of the large amounts of nitrogen dissolved in the blood.Deep dives are less dangerous if helium is substituted for nitrogen,because under these pressures helium does not exert a similar narcotic8 effect.

As a scuba diver descends,the pressure of nitrogen in the lungs increases.Nitrogen then diffuses10 from the lungs to the blood and from the blood to body tissues.The reverse occurs when the diver surfaces;the nitrogen pressure in the lungs falls and the nitrogen diffuses from the tissues into the blood and from the blood into the lungs.If the return to the surface is too rapid,nitrogen in the tissues and blood cannot diffuse9 out rapidly enough and nitrogen bubbles are formed .They can cause severe pains,particularly around the joints11.

Another complication may result if the breath is held during ascent12.During ascent from a depth of 10meters,the volume of air in the lungs will double because the air pressure at the surface is only half of what it was at 10meters.This change in volume may cause the lungs to distend13 and even rupture14.This condition is called air embolism.To avoid this event,a diver must ascent slowly,never at a rate exceeding the rise of the exhaled16 air bubbles,and must exhale15 during ascent.

20.What does the passage mainly discuss?

(A)The equipment divers use

(B)The effects of pressure on gases in the human body

(C)How to prepare for a deep dive

(D)The symptoms of nitrogen bubbles in the bloodstream.

21.The word "exposed to"in line 6are closest in meaning to

(A)leaving behind

(B)prepared for

(C)propelled by

(D)subjected to

22.The word "exert"in line 15is closest in meaning to

(A)cause

(B)permit

(C)need

(D)change

23.The word "diffuses"in line 19is closest in meaning to

(A)yields

(B)starts

(C)surfaces

(D)travels

24.What happens to nitrogen in body tissues if a diver ascends17 too quickly.

(A)It forms bubbles

(B)It goes directly to the brain

(C)It is reabsorbed by the lungs.

(D)It has a narcotic effect

25.The word "They"in line 21refers to

(A)joints

(B)pains

(C)bubbles

(D)tissues.

26.The word "rupture"in line 26is closest in meaning to

(A)hurt

(B)shrink

(C)burst

(D)stop

27.It can be inferred from the passage that which of the following presents the greatest danger to a diver?

(A)Pressurized helium

(B)Nitrogen diffusion18

(C)Nitrogen bubbles

(D)An air embolism

28.What should a diver do when ascending19?

(A)Rise slowly

(B)Breathe faster

(C)Relax completely

(D)Breathe helium.

Question 29-38

Each advance in microscopic20 technique has provided scientists with new perspectives on the function of living organisms and the nature of matter itself.The invention of the visible-light microscope late in the sixteenth century introduced a previously21 unknown realm of single-celled plants and animals.In the twentieth century,electron microscopes have provided direct views of viruses and minuscule22 surface structures.Now another type of microscope,one that utilize23 x-rays rather than light or electrons,offers a different way of examining tiny details,it should extend human perception still farther into the natural world.

The dream of building an x-ray microscope dates to 1895,its development,however,was virtually halted in the 1940's because the development of the electron microscope was progressing rapidly.During the 1940's electron microscopes routinely achieved resolution better than that possible with a visible-light microscope,while the performance of x-ray microscopes resisted improvement.In recent years,however,interest in x-ray microscopes has revived,largely because of advances such as the development of new sources of x-ray illumination.As a result,the brightness available today is millions of times that of x-ray tubes,which,for most of the century,were the only available sources of soft x-rays.

The new x-ray microscopes considerably24 improve on the resolution provided by optical microscopes.They can also be used to map the distribution of certain chemical elements.Some can form pictures in extremely short times,others hold the promise of special capabilities25 such as three dimensional imaging.Unlike conventional electron microscopy,x-ray microscopy enables specimens26 to be kept in air and in water,which means that biological samples can be studied under conditions similar to their natural state.The illumination used,so-called soft x-rays in the wavelength27 range of twenty to forty angstroms (an angstrom is one ten-billionth of a meter),is also sufficiently28 penetrating29 to image intact biological cells in many cases.Because of the wavelength of the x-rays used,soft x-ray microscopes will never match the highest resolution possible with electron microscopes.Rather,their special properties will make possible investigations30 that will complement31 those performed with light-and electron-based instruments.

29.What does the passage mainly discuss?

(A)The detail seen through a microscope

(B)Sources of illumination for microscopes

(C)A new kind of microscope

(D)Outdated microscopic technique



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1 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
2 scuba YjDzRf     
n.水中呼吸器
参考例句:
  • I first got hooked on scuba diving when I was twelve.12岁时我开始迷上了带水中呼吸器潜水。
  • While on honeymoon in Bali,she learned to scuba dive.她在巴厘岛度蜜月时学会了带水肺潜水。
3 divers hu9z23     
adj.不同的;种种的
参考例句:
  • He chose divers of them,who were asked to accompany him.他选择他们当中的几个人,要他们和他作伴。
  • Two divers work together while a standby diver remains on the surface.两名潜水员协同工作,同时有一名候补潜水员留在水面上。
4 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
5 well-being Fe3zbn     
n.安康,安乐,幸福
参考例句:
  • He always has the well-being of the masses at heart.他总是把群众的疾苦挂在心上。
  • My concern for their well-being was misunderstood as interference.我关心他们的幸福,却被误解为多管闲事。
6 intoxication qq7zL8     
n.wild excitement;drunkenness;poisoning
参考例句:
  • He began to drink, drank himself to intoxication, till he slept obliterated. 他一直喝,喝到他快要迷糊地睡着了。
  • Predator: Intoxication-Damage over time effect will now stack with other allies. Predator:Intoxication,持续性伤害的效果将会与队友相加。
7 apparently tMmyQ     
adv.显然地;表面上,似乎
参考例句:
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
8 narcotic u6jzY     
n.麻醉药,镇静剂;adj.麻醉的,催眠的
参考例句:
  • Opium is classed under the head of narcotic.鸦片是归入麻醉剂一类的东西。
  • No medical worker is allowed to prescribe any narcotic drug for herself.医务人员不得为自己开处方使用麻醉药品。
9 diffuse Al0zo     
v.扩散;传播;adj.冗长的;四散的,弥漫的
参考例句:
  • Direct light is better for reading than diffuse light.直射光比漫射光更有利于阅读。
  • His talk was so diffuse that I missed his point.他的谈话漫无边际,我抓不住他的要点。
10 diffuses 5895e5fb1e4dd2adcfbb9269bf6b7973     
(使光)模糊,漫射,漫散( diffuse的第三人称单数 ); (使)扩散; (使)弥漫; (使)传播
参考例句:
  • A gas in solution diffuses from region of greater to one of less concentration. 溶液中的气体由浓度较高的区域向浓度较低的区域扩散。
  • The sun diffuses light and heat. 太阳发出光和热。
11 joints d97dcffd67eca7255ca514e4084b746e     
接头( joint的名词复数 ); 关节; 公共场所(尤指价格低廉的饮食和娱乐场所) (非正式); 一块烤肉 (英式英语)
参考例句:
  • Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
  • Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。
12 ascent TvFzD     
n.(声望或地位)提高;上升,升高;登高
参考例句:
  • His rapid ascent in the social scale was surprising.他的社会地位提高之迅速令人吃惊。
  • Burke pushed the button and the elevator began its slow ascent.伯克按动电钮,电梯开始缓慢上升。
13 distend 58tyz     
vt./vi.(使)扩大,(使)扩张
参考例句:
  • The stomachs of starving people often distend.饥民的腹部常鼓得大大的。
  • The patients were asked to micturate to distend the urethra.采用患者自行排尿方法充盈尿道。
14 rupture qsyyc     
n.破裂;(关系的)决裂;v.(使)破裂
参考例句:
  • I can rupture a rule for a friend.我可以为朋友破一次例。
  • The rupture of a blood vessel usually cause the mark of a bruise.血管的突然破裂往往会造成外伤的痕迹。
15 exhale Zhkzo     
v.呼气,散出,吐出,蒸发
参考例句:
  • Sweet odours exhale from flowers.花儿散发出花香。
  • Wade exhaled a cloud of smoke and coughed.韦德吐出一口烟,然后咳嗽起来。
16 exhaled 8e9b6351819daaa316dd7ab045d3176d     
v.呼出,发散出( exhale的过去式和过去分词 );吐出(肺中的空气、烟等),呼气
参考例句:
  • He sat back and exhaled deeply. 他仰坐着深深地呼气。
  • He stamped his feet and exhaled a long, white breath. 跺了跺脚,他吐了口长气,很长很白。 来自汉英文学 - 骆驼祥子
17 ascends 70c31d4ff86cb70873a6a196fadac6b8     
v.上升,攀登( ascend的第三人称单数 )
参考例句:
  • The azygos vein ascends in the right paravertebral gutter. 奇静脉在右侧脊柱旁沟内上升。 来自辞典例句
  • The mortality curve ascends gradually to a plateau at age 65. 死亡曲线逐渐上升,到65岁时成平稳状态。 来自辞典例句
18 diffusion dl4zm     
n.流布;普及;散漫
参考例句:
  • The invention of printing helped the diffusion of learning.印刷术的发明有助于知识的传播。
  • The effect of the diffusion capacitance can be troublesome.扩散电容会引起麻烦。
19 ascending CyCzrc     
adj.上升的,向上的
参考例句:
  • Now draw or trace ten dinosaurs in ascending order of size.现在按照体型由小到大的顺序画出或是临摹出10只恐龙。
20 microscopic nDrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
21 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
22 minuscule V76zS     
adj.非常小的;极不重要的
参考例句:
  • The human race only a minuscule portion of the earth's history.人类只有占有极小部分地球历史。
  • As things stand,Hong Kong's renminbi banking system is minuscule.就目前的情况而言,香港的人民币银行体系可谓微不足道。
23 utilize OiPwz     
vt.使用,利用
参考例句:
  • The cook will utilize the leftover ham bone to make soup.厨师要用吃剩的猪腿骨做汤。
  • You must utilize all available resources.你必须利用一切可以得到的资源。
24 considerably 0YWyQ     
adv.极大地;相当大地;在很大程度上
参考例句:
  • The economic situation has changed considerably.经济形势已发生了相当大的变化。
  • The gap has narrowed considerably.分歧大大缩小了。
25 capabilities f7b11037f2050959293aafb493b7653c     
n.能力( capability的名词复数 );可能;容量;[复数]潜在能力
参考例句:
  • He was somewhat pompous and had a high opinion of his own capabilities. 他有点自大,自视甚高。 来自辞典例句
  • Some programmers use tabs to break complex product capabilities into smaller chunks. 一些程序员认为,标签可以将复杂的功能分为每个窗格一组简单的功能。 来自About Face 3交互设计精髓
26 specimens 91fc365099a256001af897127174fcce     
n.样品( specimen的名词复数 );范例;(化验的)抽样;某种类型的人
参考例句:
  • Astronauts have brought back specimens of rock from the moon. 宇航员从月球带回了岩石标本。
  • The traveler brought back some specimens of the rocks from the mountains. 那位旅行者从山上带回了一些岩石标本。 来自《简明英汉词典》
27 wavelength 8gHwn     
n.波长
参考例句:
  • The authorities were unable to jam this wavelength.当局无法干扰这一波长。
  • Radio One has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。
28 sufficiently 0htzMB     
adv.足够地,充分地
参考例句:
  • It turned out he had not insured the house sufficiently.原来他没有给房屋投足保险。
  • The new policy was sufficiently elastic to accommodate both views.新政策充分灵活地适用两种观点。
29 penetrating ImTzZS     
adj.(声音)响亮的,尖锐的adj.(气味)刺激的adj.(思想)敏锐的,有洞察力的
参考例句:
  • He had an extraordinarily penetrating gaze. 他的目光有股异乎寻常的洞察力。
  • He examined the man with a penetrating gaze. 他以锐利的目光仔细观察了那个人。
30 investigations 02de25420938593f7db7bd4052010b32     
(正式的)调查( investigation的名词复数 ); 侦查; 科学研究; 学术研究
参考例句:
  • His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查,但没有发现什么。
  • He often sent them out to make investigations. 他常常派他们出去作调查。
31 complement ZbTyZ     
n.补足物,船上的定员;补语;vt.补充,补足
参考例句:
  • The two suggestions complement each other.这两条建议相互补充。
  • They oppose each other also complement each other.它们相辅相成。
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