the tiniest electric motor in the world

　　tiny：very small微小的
　　1. scientists recently made public the tiniest electric motor ever built. you could stuff hundreds of them into the period at the end of this sentence. one day a similar engine might power a tiny mechanical doctor that would travel through your body to remove your disease.

　　make public：公布
　　2. the motor works by shuffling atoms between two molten metal droplets in a carbon nanotube. one droplet is even smaller than the other. when a small electric current is applied to the droplets, atoms slowly get out of the larger droplet and join the smaller one. the small droplet grows - but never gets as big as the other droplet - and eventually bumps into the large droplet. as they touch, the large droplet rapidly sops up the atoms it had previously lost. this quick shift in energy produces a power stroke.
　　3. the technique exploits the fact that surface tension -- the tendency of atoms or molecules to resist separating -- becomes more important at small scales. surface tension is the same thing that allows some insects to walk on water.
　　4. although the amount of energy produced is small -- 20 microwatts -- it is quite impressive in relation to the tiny scale of the motor. the whole setup is less than 200 nanometers on a side, or hundreds of times smaller than the width of a human hair. if it could be scaled up to the size of an automobile engine, it would be 100 million times more powerful than a toyota camry’s 225 horsepower v6 engine.

　　that is，i, e，or … 即
　　5. in 1988, professor richard muller and colleagues made the first operating micromotor, which was 100 microns across, or about the thickness of a human hair. in 2003, zettl’s group created the first nanoscale motor. in 2006, they built a nanoconveyor, which moves tiny particles along like cars in a factory.
　　6. nanotechnology engineers try to mimic nature, building things atom-by-atom. among other things, nanomotors could be used in optical circuits to redirect light, a process called optical switching. futurists envision a day when nanomachines, powered by nanomotors, travel inside your body to find disease and repair damaged cells.

　　使用，应用，利用：
　　use
　　apply
　　utilize
　　harness
　　练习：
　　1. paragraph 2 ________
　　【答疑编号11030601】
　　答案：e
　　2. paragraph 4 ________
　　【答疑编号11030602】
　　答案：b
　　3. paragraph 5 ________
　　【答疑编号11030603】
　　答案：d
　　4. paragraph 6 ________
　　【答疑编号11030604】
　　答案：f

　　干扰选项：
　　1.没有展开的选项
　　2.偏、反

napping to a healthier heart?

　　researchers say they have developed a simple test that can tell if a person with heart disease is likely to suffer a heart attack. the test measures levels of a protein in the blood. the researchers say people with high levels of this protein are at high risk of heart attack, heart failure or stroke.
　　kirsten bibbins-domingo of the university of california in san francisco led the team. for about four years, they studied almost one thousand patients with heart disease. the researchers tested the heart disease patients for a protein called nt-probnp. patients with the highest levels were nearly eight times more likely than those with the lowest levels to have a hear t attack, heart failure or stroke.
　　the researchers say the presence of high levels of the protein in the blood shows that the heart muscle is under pressure in some way. the study involved mostly men, so the researchers could not say for sure that the results are also true for women. they say the patients with the highest levels of nt-probnp were older and had other problems like diabetes or high blood pressure.
　　other researchers say more studies are needed to confirm if knowing the protein levels of a heart patient should affect that person’s treatment. they also would like to know if more aggressive treatment could reduce the patient’s chance of a heart attack or stroke. the study appeared in the journal of the american medical association.
　　could a little sleep during the middle of the day reduce the risk of a heart attack? an unrelated study earlier this month in the archives of internal medicine suggests that the answer may be yes. in countries like the united states, afternoon naps are mostly for children. but they are common for adults in mediterranean countries. and these countries generally have lower rates of heart disease. so scientists in the united states and greece wondered if naps could play a part. twenty-three thousand healthy adults took part in the study by harvard university and the university of athens. those who took thirty-minute naps three times a week had a thirty-seven percent lower risk of death from heart problems than people who did not take naps.
　　the researchers say napping may improve heart health by reducing stress. they say the research suggests that naps are especially good for working men. but they say not enough female subjects died during the study to judge the benefits for women.

　　stress：压力
　　pressure：压力
　　练习：
　　1. paragraph 2 ________
　　【答疑编号11030605】
　　答案：f
　　2. paragraph 3 ________
　　【答疑编号11030606】
　　答案：b
　　3. paragraph 5 ________
　　【答疑编号11030607】
　　答案：d
　　4. paragraph 6 ________
　　【答疑编号11030608】
　　答案：a

　　完成句子部分
　　解题技巧：
　　●找出题目中的特征词（专有名词、数字、数词、年代、名词/名词短语、形容词、副词），确定题目在文章中的位置
　　●对比题目与文章中相关句，并根据题目中的其他信息确定正确答案
　　●做题时，充分利用一些基本的语法知识辅助判断
　　●注意题目的顺序与文章的顺序一致
　　举例：

english and english community

　　3. we may say that anyone who speaks english belongs to the english speech community. for convenience, we may classify the speakers into two groups: one in which the speakers use english as their native language, the other in which the speakers learn english as a second language for the purpose of education, commerce, and so on.
　　4. english serves as an alternative language in several areas of public activity for the many nations of the world which employ it as an international second language. english has been adopted as the language of air traffic, commerce, as well as international diplomacy. moreover, english is the language of the majority of published materials in the world so that education has come to rely heavily on an understanding of english.
　　练习：
　　1. only through the shared language _______.
　　【答疑编号11030701】
　　答案：b

　　can you speak english?

DFi_WtI+}@&]jTK=[转 贴 于 我 的 学 习 网 外语园地职称英语 HTtp://wwW.gzU521.coM)DFi_WtI+}@&]jTK=

　　only, so, nor, not, never, no
　　2. the idea of the national boundaries is often different from _______.
　　【答疑编号11030702】
　　答案：a

　　from
　　in
　　on
　　into
　　with
　　3. speakers are classified into two groups _______.
　　【答疑编号11030703】
　　答案：d
　　4. an understanding of english _______.
　　【答疑编号11030704】
　　答案：e

the making of a success story

　　1. ikea is the world’s largest furniture retailer, and the man behind it is ingvar kamprad, one of the world’s most successful entrepreneurs. born in sweden in 1926, kamprad was a natural businessman. （5）as a child, he enjoyed selling things and made small profits from selling matches, seeds, and pencils in his community. when kamprad was 17, his father gave him some money as a reward for his good grades. naturally he used it to start up a business - ikea.
　　2. ikea’s name comes from kamprad’s initials （i.k.） and the place where he grew up （‘e’ and‘a’）. （6）today ikea is known for its modem, minimalist furniture, but it was not a furniture company in the beginning. rather, ikea sold all kinds of miscellaneous goods. kamprad’s wares included anything that he could sell for profits at discounted prices, including watches, pens and stockings.

　　other
　　3. ikea first began to sell furniture through a mail-order catalogue in 1947. the furniture was all designed and made by manufacturers near kamprad’s home. initial sales were very encouraging, so kamprad expanded the product line. furniture was such a successful aspect of the business that ikea became solely a furniture company in 1951.
　　4. in 1953 ikea opend its first showroom in almhult, sweden. ikea is known today for its spacious stores with furniture in attractive settings, but in the early 1950s, people ordered from catalogues. （7）thus response to the first showroom was overwhelming: people loved being able to see and try the furniture before buying it. this led to increased sales and the company continued to thrive. by 1955, ikea was designing all its own furniture.
　　5. in 1956 kamprad saw a man disassembling a table to make it easier to transport. kamprad was inspired. the mart had given him a great idea: flat packaging. （8）flat packaging would mean lower shipping costs for ikea and lower prices for customers. ikea tried it and sales soared. the problem was that people had to assemble furniture themselves, but over time, even this grew into an advantage for ikea. nowadays, ikea is often seen as having connotations of self-sufficiency. this image has done wonders for the company, leading to better sales and continued expansion.
　　6. today there are over 200 stores in 32 countries. amazingly, ingvar kamprad has managed to keep ikea a privately-held company. in 2004 he was named the world’s richest man. he currently lives in switzerland and is retied from the day-to-day operations of ikea. ikea itself, though, just keeps on growing.
　　练习：
　　5. even when he was only a child, _______.
　　【答疑编号11030705】
　　答案：c
　　6. _______, and years later became a big company specialized in manufacturing and selling of furniture.
　　【答疑编号11030706】
　　答案：a
　　7. customers liked the idea of ikea’s showrooms because _______.
　　【答疑编号11030707】
　　答案：e
　　8. as flat packaging saves money for both ikea and the customers, _______.
　　【答疑编号11030708】
　　答案：b