SSS科学60秒mp3+文本下载(20091005)
KS40操作手册
3.1 正面图 ........................................................................................................................10
3.2 通电后的运行情况 ....................................................................................................11
5 参数设定级别 ............................................................................................................39
5.1 参数检查 ....................................................................................................................39
4.3 设定点处理过程 ........................................................................................................31
4.4 4.4.1 4.4.2 4.4.3 4.4.4 4.4.5 4.4.6 4.5.7
操作结构 ....................................................................................................................19
ISO 3834-1
Preisgruppe 8 www.din.de
www.beuth.de
!,d&b"
9650363
Ausdrucke aus der digitalen Datenbank der TÜV Rheinland Group. Vervielfältigung lt. Merkblatt 3 (2004-02) des DIN.
b) zu Abschnitt 2: Normative Verweisungen sind im neuen Teil 5 von DIN EN ISO 3834 enthalten.
c) zu Abschnitt 3: Es wurden neue Begriffe und Definitionen aufgenommen.
Anfragen zur offiziellen Auslegung der Inhalte dieser Norm sollten über das jeweilige nationale Normungsinstitut an das Sekretariat des ISO/TC 44/SC 10 gerichtet werden. Eine vollständige Auflistung kann über bezogen werden.
EUROPÄISCHE NORM EUROPEAN STANDARD NORME EUROPÉENNE
ICS 25.160.01
EN ISO 3834-1
Dezember 2005
Ersatz für EN 729-1:1994
IEC_62196
Winfried Tröster (Member of PT62196) (Chairman DE NC UK 542.4)
IEC 62196-2-X © IEC:200X
–1–
CEI 62196-2-X © CEI:200X
CONTENTS
FOREWORD.......................................................................................................................... INTRODUCTION................................................................................................................... 1 Scope...............................................................................................................................2 2 Normative references .......................................................................................................3 3 Definitions .................................................................................................
211291611_天籁之音
1那天晚上我从小超市回来，已经过了平日里玥玥睡觉的时间了。
她却把拖鞋踢在一旁，光着两只脚丫用某个光头明星常用的姿势躺在沙发上，全神贯注地盯着电视。
老靳就坐在她身旁似睡非睡地半闭着眼睛，从山东回来后，他像一只缺氧的大公鸡一样经常耷拉着脑袋。
上小学后，按时睡觉对玥玥来说是件非常重要的事情。
她必须保证充足的睡眠，一旦晚睡就会影响第二天的学习状态。
我们家距离学校半小时车程，为确保不迟到，每天早上六点半玥玥就得起床，七点一刻前必须从家里出发。
早起就得早睡，为确保按时睡觉，一放学她就不得不马不停蹄地完成作业。
虽然只是读小学二年级，但玥玥的作业并不少，语文、数学、英语、手工小报以及跳绳和消防问卷等等，差不多要两个小时才能完成。
玥玥只有七岁，要高质量完成这么多科目的作业只能依靠家长的辅导。
所以，我每天下了班就拼命往家里赶，晚饭可以不吃，辅导玥玥做作业却丝毫不敢怠慢。
那天是老靳主动提出来帮我辅导玥玥的，他让我安心去小超市帮忙。
老靳年轻的时候在村里当过会计，后来又在外面闯荡了这么多年，我估摸着他肚子里的墨水对付小学二年级的作业应该绰绰有余，便放心地去帮靳燕。
靳燕的小超市是我们家的主要收入来源，为节约开支，我们没有聘请员工，从早上六点到晚上十点，靳燕就像蜘蛛一样蹲守在上千种货物织出的网中，她必须全神贯注，就连上厕所也得匆匆忙忙。
她烦透了小超市的生活以至于看到收银机就想吐。
我理解她的烦躁，所以只要略有空当，我都会去帮她。
一进门我就关心起玥玥的作业完成情况，玥玥正沉浸在一档选秀节目中，对我的话毫无反应。
她的作业本、铅笔盒、剪刀、跳绳、手工纸等等横七竖八地堆在茶几上。
老靳依旧似睡非睡，并没发现我进了屋。
我上前关掉了电视，玥玥才极不情愿地从沙发上下来，蹲下身子满地找拖鞋。
老靳随即醒来，冲我笑了笑说：“回来了？作业已经做完了。
”说着他起身整理起茶几上的作业本。
我拦住他说：“让她自己处理。
”他的手停在了半空中，笑了笑说他先去洗澡，接着就回了卧室。
SSS字母练习册 彩色 更多资源请关注蜗牛的启蒙世界
j
Color the j’s orange.
lj k l
My name is...
jj
Circle the words that start with j.
Connect the D’s. Color them orange.
F DD
D
F
DDF
F
E
F
ED
D
D
D
DF D
D
E
EDF
Get more worksheets at
© Super Simple Learning 2014
Super Simple ABCs - Printables
fd e
d e dd
© Super Simple Learning 2014
Super Simple ABCs - Printables
Letter Recognition & Phonics
D
Color the D’s orange.
E
FD
D
DE D
My name is...
F
D
D
E
Circle the words that start with D.
Color the h’s blue.
h gi h
i
h
Circle the words that start with h.
Connect. Color the h’s blue.
i
h
g
i
h
g
Get more worksheets at
g h i
Sixty-Second-Science(SSS)听力笔记
Date: 2012/7/6 From: sss20120102 Source: D:\CHASEDREAM\SSS\201201\201201\sss20120102.mp3Happy New Year! And don’t feel bad about taking today off.After all you’ve travelled far.And I’m not about talking about the trip home from the party.According to NASA, just by being on the planet Earth in the last year,you’ve zipped about 584 million miles around the sun to get back where you were,At an average speed of about 67,000 miles per hour.Again, not talking you about the drive home from the party.Of course the trip was not a perfect circle. As Kepler[开普勒] showed, the Earth’s orbit is an ellipse, with the sun at one of the two focal points.He also figured out the planet goes faster when it’s at perihelion, near the sun, than when it’s at aphelion, its farest distance, which would explain why summer seems to zip by, except the seasons are a function of the tilt of the Earth’s axis, not its different distances from the Sun. And the Earth rotated 365 and a quarter times during its sweep around the Sun.The trip took about 8766 hours or 31,557,600 seconds or 525,960 minutes just like this one.Happy New Year! And don‟t feel bad about taking today off. After all, you‟ve traveled far. And I‟m not talking about the trip home from the party. According to NASA, just by being on the planet Earth in the last year, you‟ve zipped about 584 million miles around the sun to get back where you were. At an average speed of about 67,000 miles per hour. Again, not talking about the drive home from the party.Of course, the trip was not a perfect circle. As Kepler showed, the Earth‟s orbit is an ellipse, with the sun at one of the two focal points. He also figured out the planet goes faster when it‟s at perihelion, nearer the sun, than when it‟s at aphelion, its farthest distance. Which would explain why summer seems to zip by, except the seasons are a function of the tilt of the Earth‟s axis, not its different distances from the sun. And the Earth rotated 365 and a quarter times during its sweep around the sun. The trip took8,766 hours. Or 31,557,600 seconds. Or 525,960 minutes just like this one.Main Points1. Last year, just being on the planet, you’ve been zipped around the sun for 584 million miles to get back where you were at an average speed of 67,000 miles per hour, said NASA. But the orbit the Earth goes around the sun is not a perfect circle, but an ellipse.2. It also figured out the planet goes faster when it’s at perihelion, near the sun, than when it’s at aphelion, its farthest distance, explaining why summer seems to zip by, except the seasons are a function of the tilt of the Earth’s axis.3. The Earth rotated 365 and a quarter times during its sweep around the sun, taking 8,766 hours, or 525,960 minutes, or 31,577,600 seconds.Words：Kepler: 开普勒【开普勒望远镜】perihelion: 近地点【夏天，地球自转快】aphelion: 远地点【冬天，地球自转慢】focal points: 焦点Correction：Date: 2012/7/7 From: sss20120103 Source: D:\CHASEDREAM\SSS\201201\201201\sss20120103.mp3Ever wondered why mosquitoes eat some people up but leave others‘relatively unscathed?A new study finds this preferential treatment is due to the smells produced by the microscopic critters that cover our bodies.The research is in the journal Public Library Science ONE.To a mosquito every human body has a particular smell. And the differences are due in part to the particular bacteria on each individual’s skin.The study tested the malaria-transmitting Anopheles gambiae in mosquito’s attraction to the odors of 50 adult men.The participants avoided items such as garlic, that would change their natural smell. Researchers collected the male scents by rubbing glass beads on the bottom of each participant’s foot, and swabbed the same skin for microbes. And they discovered that mosquitoes preferred the smell of skin with more abundant-but less diverse- bacteria communities.The scientists suggest that diverse communities may includ some microbes that produce compounds mosquitoes naturally dislike.If further research can identify these compounds, it could lead to the development of repellents to make bloodthirsty mosquitoes buzz off.Ever wondered why mosquitoes eat some people up but leave others relatively unscathed?A new study finds that this preferential treatment is due to the smells produced by the microscopic critters that cover our bodies. The research is in the journal Public Library of Science ONE.To a mosquito, every human has a particular smell. And the differences are due in part to the particular bacteria on each individual‟s skin.The study tested the malaria-transmitting Anopheles gambiae mosquito‟s attraction to the odors of 50 adult men. The participants avoided items, such as garlic, that would change their natural smell.Researchers collected the male scents by rubbing glass beads on the bottom of each participant‟s foot, and swabbed the same skin for microbes. And they discovered that mosquitoes preferred the smell of skin with more abundant—but less diverse—bacterial communities.The scientists suggest that the diverse communities may include some microbes that produce compounds mosquitoes naturally dislike. If further research can identify these compounds, it could lead to the development of repellents to make bloodthirsty mosquitoes buzz off.Main Points:Mosquitoes prefer the skin with more abundant but less diverse bacteria communities.Words:unscathed: [,ʌn'skeiðd] 未受伤的microscopic：显微镜可见的critter: [谑，方] 家畜，牛，马；[贬]人preferential: [,prefə'renʃəl] adj. 优先的；选择的；特惠的；先取的malaria-transmitting Anopheles gambiaebead: 玻璃粉swab：[swɔb] n. 药签，拭子；医用海绵，纱布；拖把，擦帚；无赖vt. 打扫，擦拭；涂抹（药）于repellent [ri'pelənt] adj. 排斥的；防水的；弹回的；令人讨厌的n. 防护剂；防水布；排斥力bloodthirsty：buzz: vt. 使嗡嗡叫；暗中散布vi. 作嗡嗡声；东奔西忙Date: 2012/7/8 From: sss20120104 Source:D:\CHASEDREAM\SSS\201201\201201\sss20120104.mp30:24.770-0:27.986 The study’s proceeding with the academic scientists.The study is in Proceedings of the National Academy of Sciences.0:32.539-0:36.590 and three are crafted by the legendary straterwarrier guonerian in the 18th century.three crafted by the legendary Stradivari or Guarneri0:44.499-0:47.454 in the darkened room were wearing vision modify gogs.in a darkened room while wearing vision-modifying goggles.0:47.751-0:51.583 adept from a few mangdired of the Qingrest even the mass the intruments' scentsA dab of perfume under the chin rests even masked the instruments‟scents.原文：Can you tell the difference between modern violins and antiques crafted by Italian masters? Don‟t feel too bad—expert players can‟t do it either. In a double-blind test, 21 experienced violinists were unable to tell the difference between rare, old instruments and new ones. The study is in Proceedings of the National Academy of Sciences. [Claudia Fritz et al., "Player preferences among new and old violins"]Researchers provided violinists with six high-quality instruments: three modern and three crafted by the legendary Stradivari or Guarneri in the 18th century—and worth a hundred times as much as the new ones.To prevent bias, everyone who handled the violins did so without knowing which instrument was which, in a darkened room while wearing vision-modifying goggles. A dab of perfume under the chin rests even masked the instruments‟ scents. After playing each violin, the subjects rated them and selected their favorite one.When it came to instrument quality, the old and new violins earned similar scores, and fewer than half of the participants chose old violins as their favorites. Apparently, a violin by any other craftsman can sound as sweet.Main pointsExperienced violinists were unable to tell the difference between rare, old instruments and new onesWords:Stradivari or Guarnerivision-modifying goggles：A dab of perfume ：少量的香水Date：2012/7/9 From：sss20120105 Source: D:\CHASEDREAM\SSS\201201\201201\sss20120105.mp30:22.374-0:25.254 the study use the method commonly explored on babiesThe study, used a method commonly deployed on babies0:52.886-0:57.277 meaning the animate delivery style fuse the dogs of an intentioned communicateMeaning the animated delivery style cues the dogs of an intension tocommunicate.0:57.557-1:00.773 dogs thus perceive such an intense similarly to babiesDogs thus perceive such intent similarly to babies.Sit, stay, down, no, don't eat that, drop it. Dogs. We pet them, we love them, we talk to them. But are they listening?Of course they are. And recent research found that dogs are paying attention not only to what we say, but to how we say it.The study, used a method commonly deployed on babies: tracking eye movements. If the baby, or in this case the dog, looks at something, it‟s assumed that they're interested in it. The researchers showed dogs two videos. In one, a person looks into the camera and says "hi dog!" in a high-pitched voice before turning towards a plastic pot. In the other, the person av oids eye contact and says “hi dog” in a lower voice before turning towards the pot.And the dogs looked at the pot more often after the "hi dog!" than after the “hi dog.” Meaning the animated delivery style cues the dogs of an intension to communicate.Dogs thus perceive such intent similarly to babies. Except babies are slightly less likely to dig up the flowers in that plastic pot.Main ideacue sb. of an intention to do sth. : 给某人以做某事的意图sb. perceive sth. similarly to sb.: 某人和某人的想法很像Date：2012/7/10 From：sss20120109 Source: D:\CHASEDREAM\SSS\201201\201201\sss20120109.mp30:12.283 –0:17.452 had spreaded to the Dominica Republic in the U.S., and then to the Venezuela, Mexico, Spain, and Canada.had spread to the Dominican Republic and the U.S.0:17.566 –0:21.808 thus arger tools are needed to help avoid such national and international perdemics.Fast and accurate tools are needed to help avoid such national andinternational epidemics.0:21.951 –0:26.536 But it often takes weeks for traditional diseases serverlence ma that’s too villn announce its spread.But it often takes weeks for traditional disease surveillance methodsto reveal an illness‟s spread.0:30.046 – 0:36.079 They called information in 8 languages from sources such as new articles and blogs during the first 100 days after the earthquake.They culled information0:41.813 - 0:45622 They matched the outbreaks and determined its progress by an application called Health Map.they mapped the outbreak and determined its progress, via anapplication called Health Map.1:04.493 – 1:07.802 and potentially helps limit suffering such as Haiti’s in the future.After Haiti‟s earthquake two years ago, cholera swept the country. And within a month, the same strain had spread to the Dominican Republic and the U.S., and then to Venezuela, Mexico, Spain, and Canada.Fast and accurate tools are needed to help avoid such national and international epidemics. But it often takes weeks for traditional disease surveillance methods to reveal an illness‟s spread. So researchers turned to the internet as a possible tracking tool. They culled information in eight languages from sources such as news articles and blogs during the first hundred days after the earthquake. They also searched Twitter.With data from more than 4,500 reports and nearly 189,000 tweets, they mapped the outbreak and determined its progress, via an application called Health Map. The information matched official results in certain places and generally followed the same trends. But unlike the officially issued information, this data could be collected immediately—and could have been available up to two weeks faster. The comparison was published in the American Journal of Tropical Medicine and Hygiene.The scientists say these methods could provide a faster response to an epidemic—and potentially help limit suffering such as Haiti‟s in the future.Main PointsAnalysis of social media and Internet news reports can enable researchers to track a disease outbreak faster than conventional medical notifications.Words:cholera ['kɔlərə] n. [医]霍乱strain n. 张力；拉紧；负担；扭伤；血缘epidemics [,epi'demiks] n. 流行病；蔓延（epidemic的复数）；时疫Hygiene ['haidʒi:n] 卫生；卫生学Date：2012/7/16 From：sss20120111Source: D:\CHASEDREAM\SSS\201201\201201\sss20120110.mp3补番~People with high blood pressure are often told to watch the salt. And it‟s long been thought that hypertension related to excess salt is caused by the salt increasing the volume of the blood. Which in turn puts added pressure on the blood vessel walls. But going back to the 1960s and …70s, some researchers thought that the salt might be having a different effect.Now long-time hypertension researchers Irene and Haralambos Gavras at the Boston University School of Medicine have analyzed the studies in the field and published a review article explaining what they think salt‟s role really is: it stimulates the sympathetic nervous system to produce adrenalin. And it‟s the adrenalin that constricts the arteries and causes the high blood pressure, not excess fluid volume. The review is in the Journal of Hypertension.Physicians have accepted a nervous system involvement in hypertension that’s bad enough to cause kidney failure. Fluid-decreasing diuretics are a common treatment in those severe cases. This new analysis implies that researchers should look for additional hypertension treatments that focus on the nervous system.Wordshypertension:高血压，过度紧张【hypotension :低血压】sympathetic nervous system：交感神经系统adrenalin肾上腺素arteries ：artery的复数，动脉excess fluid volume 超额的流量kidney failure :肾衰竭Fluid-decreasing diuretics ：减缓流量的利尿药物[diuretic /,daijuə'retik/ adj. 利尿的n. 利尿剂]Main IdeaThe role of salt in the hypertension has changed according to some scientists: i nstead of the excess fluid volume that adds extra pressure to the vessels wall caused by excess salt, it’s the adrenalin produced by the sympathetic nervous system constricts the arteries that cause the hypertension.Rather than increase fluid volume, salt's real role in high blood pressure may be to induce the nervous system to produce excess adrenalin.Date：2012/7/16 From：sss20120113Source: D:\CHASEDREAM\SSS\201201\201201\sss20120113.mp3 Magnifying glass, calipers, teeny tiny tape measure. These are the weapons with which researchers are fighting it out to find the world‟s smallest frog.One team just announced the discovery of the on-average 7.7 millimeter Paedophryne amanuensis, which can sit comfortably on a dime. It was discovered in the moist under-layer of New Guinea’s tropical rainforest. The research was published in the journal Public Library of Science One.The little guy thus ousts another New Guinea frog, which had only claimed the title in December. The newest frog species is also being cited as the world‟s smallest vertebrate, although it‟s more correctly the smallest free-living vertebrate. A 6.2 millimeter male anglerfish spends its life buried in the body of its mate.Finding the little frog was no small achievement. Besides being tiny, the high-pitched mating calls researchers followed sound more insect than amphibian. [Frog calls.]Tiny vertebrates reveal changes that make miniaturization possible. For instance, some of the digits on the frogs‟ feet have disappeared. And their skulls develop differently than those of larger critters.So we celebrate the world‟s smallest frog and free-living vertebrate. Until the next one is discovered.Wordsmagnifying glass: 放大镜caliper：卡钳teeny tiny tape measure：超级微小的卷尺Paedophryne amanuensisdime：一角硬币New Guinea：新几内亚amphibian：sounds like:anfibian 两栖动物critters:牲畜Mean IdeaResearchers say a newly discovered species is the world's smallest frog--and more.Source：D:\CHASEDREAM\SSS\201201\201201\20120117.mp3Date: 2012/7/18 From: sss20120123Source: D:\CHASEDREAM\SSS\201201\201201\sss20120123.mp3Lots of studies suggest limited quantities of alcohol—like one drink a day—can benefit your cardiovascular health. But for the tiny worm C. elegans, dilute booze is a veritable fountain of youth. It actually doubles their life span, according to a study in the journal Public Library of Science ONE.The researchers discovered the alcohol effect by accident. In an earlier study, they thought it was a dose of cholesterol that extended the worms' lives. But after review, they realized that the true agent was the weak alcohol solution the cholesterol was dissolved in. Starving worm larvae that usually live 10 days could survive 20 to 30 in the presence of alcohol. And a watery drink at that—the equivalent of one beer, poured into 100 gallons of water.The authors aren't sure what‟s behind the alcohol outcome. It could be a life-saving energy source for the starving worms. Or it might flip a switch that ups the worms' stress resistance. We humans do share some chemical signaling pathways with worms—the insulin response, for example. But the researchers say assuming a similar longevity effect for us is a dangerous road to go down. Especially after drinking.Words:cardiovascular:心脏血管的[cardio-是心脏的前缀，vascular：血管的]dilute booze：稀释的酒= watery drinkveritable：名副其实的，真正的life span：生命跨度cholesterol：flip a switch：轻弹开一个开关insulin：胰岛素Main IdeaA very dilute alcohol solution doubles the life span of the ubiquitous lab organism C. elegans.It‟s known that taller people tend to have more jobs with more authority—and higher salaries. But there‟s a flip side—the more powerful a person is, the taller he or she feels.The researchers who investigated this phenomenon were inspired by the BPchairman’s comment after the oil spill about the “small people.” There are many such metaphors—think “big man on campus.” Could these metaphors influence—or reflect—reality? Might powerful people actually overestimate how tall they are?Scientists created three experiments with nearly 300 participants. In each, the participants were made to feel more or less powerful: being chosen as, say, a manager versus an underling. Then they faced a task in which they estimated their own height—comparing their actual height to a pole, for example, or choosing the height ofan online avatar.In each case, when the participants were in a position of power, they represented their height as significantly taller than those in weaker positions. The research was publishedin the journal Psychological Science.So, the researchers conclude, the “beleaguered CEO of BP” inadvertently led them a new finding. When we feel powerful, we feel on top of the world—or, quite literally, tall.Words:a flip side:反面metaphors：暗喻underling：下属beleaguered：受围攻的inadvertently：不经意间he or she feels 弱读、连读：heεəshe feelsof an online avatar 弱读、连读：əvanoline avatarthe “beleaguered CEO of BP” inadvertently：thequote “beleaguered CEO of BP” inadvertently 【引用的语的引号读出来了但是不用写出来。
2019年精选科学七年级上册走近科学3.建立健康信息档案华师大版巩固辅导第四十篇
2019年精选科学七年级上册走近科学3.建立健康信息档案华师大版巩固辅导第四十篇第1题【单选题】下列数据符合实际的是( )A、人的正常体温是27℃左右B、家用空调正常工作时的电压为220VC、中学生的质量约为500ND、声音在水中的传播速度是340m/s【答案】：【解析】：第2题【单选题】下列单位换算正确的是( )A、30米=30米×10 =300分米B、30米=30米×10分米=300分米C、30米=30×10分米=300分米D、30米=30分米×10=300分米【答案】：【解析】：第3题【单选题】量筒做得细而高，不做成粗而矮的形状，这主要是因为( )A、实验中，细高的量筒便于操作B、细高的量筒可以做出相对较大的底座，增加稳度C、细高的量筒与粗矮的相比，相应的刻度间隔较大，便于准确地读数D、粗矮量筒中的液体较多，筒壁所受压强较大，需用较厚的玻璃，因而不便读数【答案】：【解析】：第4题【单选题】做某实验需要量取45毫升的水，应选用下列仪器中的( )A、100毫升的烧杯B、10毫升的量筒C、100毫升的烧杯和滴管D、50毫升的量筒和滴管【答案】：【解析】：小珂同学用同一把刻度尺对同一物体的长度进行了4次测量，结果如下：14.34cm、14.36cm、14.35cm、14.48cm，则该物体的长度应记为( )A、14.35cmB、14.36cmC、14.37cmD、14.38cm【答案】：【解析】：第6题【单选题】人类认识自然需要借助于一些仪器，自从扫描隧道显微镜发明后，世界上就诞生了一门以0.1 至100 纳米这样的单位为研究对象的前沿科学，这就是纳米技术，它以空前的分辨率为人类揭开了更加广阔的微观世界。
这里所说的纳米是指( )A、长度单位B、质量单位C、时间单位D、温度单位【答案】：【解析】：判断下列测量数据：0.3260米, 7.59米, 759毫米, 759分米, 各自对应的刻度尺的最小刻度是( )A、分米、毫米、厘米、米B、厘米、分米、毫米、米C、毫米、厘米、分米、米D、毫米、分米、厘米、米【答案】：【解析】：第8题【填空题】2015年1月，“蛟龙”号在印度洋深海处打捞上来一未知生物，该生物A处的宽度为______cm．打捞上来的过程中，该生物受到的海水压强______（变小/不变/变大），会对其生命活力产生影响．【答案】：【解析】：第9题【填空题】小强同学选择了一只量程适当的温度计，插入热水后立即拿出来，进行读数；请纠正他操作中的两处错误：______；______。
【听力资料】科学美国人听力原文-科学家或揭开人们追寻记忆味道的奥秘
【听力资料】科学美国人听力原文-科学家或揭开人们追寻记忆味道的奥秘科学美国人听力原文-科学家或揭开人们追寻记忆味道的奥秘在托福听力练习中，我们究竟该选择怎样的材料呢?科学美国人的六十秒科学(简称SSS)是练习托福听力的利器材料，它短小精悍，仅仅有一分钟的时间，语速也非常快。
其中包含了许多科学知识和实验和托福的学术性息息相关，相信能为大家的托福听力提升带来很大的帮助。
听力原文In Marcel Proust’s iconic Remembrance of ThingsPast, a taste of cake elicitsa flood of memories.Now a study finds that the stronger your memory ofa particular food, the more likely you are to chooseit again.And it doesn’t matter how objectively unattractivethe food may be—which perhaps explains why you may crave those peanut butter andmarshmallow sandwiches from your youth or can’t break that fried chicken habit when trying todiet.The food-memory study is in the journal Neuron.Researchers asked 30 hungry young people to rate snacks such as potato chips and chocolate.No actual food was presented.The snacks were merely displayed on screens associated with locations.Then the study participants were asked to choose between two locations, as proxies for thesnacks.And the hungry subjects went with memory over taste preference—that is, they picked whatthey were better able to remember even if they had rated them lower in the first part ofthetest.And the researchers found that the exercise caused increased communication between thehippocampus, associated with memory, and the part of the frontal lobe home to decision-making.Which may show why when we’re making food deci sions, familiarity often wins out over otherfactors—and why your shopping list looks virtually the same week after week.。
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官方网站： SSS科学60秒mp3+文本下载(20091005)
SSS科学60秒mp3+文本下载(20091005)
SSS 2009-10-05
This is Scientific American's 60-second Science. I'm Steve Mirsky. Got a minute?
The 2009 Nobel Prize in physiology or medicine goes to Harvard’s Jack Szostak, Johns Hopkins’s Carol Greider and Elizabeth Blackburn at U.C. San Francisco for their work on how chromosomes are protected by telomeres and the enzyme telomerase.
The Nobel laureates’ research helped explain how an organism’s DNA is successfully copied when cells divide. Telomeres are genetic sequences that act like little protective caps at the end of chromosomes—think of the sealed tips of your shoelaces. Telomerase is the enzyme that builds telomeres.
Blackburn and Szostak determined that it was a specific DNA sequence in the telomeres that kept chromosomes from fraying whenever they were copied when a cell splits in two. Blackburn and Greider discovered telomerase. The findings have implications for the understanding of aging and cancer. Because if the enzyme keeps the telomeres robust, the chromosomes stay protected and the cell’s aging is slowed. And in cancer cells, which unfortunately do not seem to age, telomere length is maintained virtually indefinitely. Szostak, Greider and Blackburn thus revealed one of life’s basic mechanisms, and paved the way for new medical strategies.
—Steve Mirsky...
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