Heritage versus Marketing

“I have a dream...” It is among the most celebrated speeches in American history. “My four little children will one day live in a nation where they will not be judged by the color of their skin

英语听力文摘 English Digest 6、Women See More Color

In this Moment of Science Yael and Don discuss how women can see more color. Yael: Not only are eight percent of men colorblind, but even compared to men who can distinguish between reds and greens, many women may live a more colorful existence. That

阿尔卡特，朗讯即将合并

Shareholders of the telecommunications equipment manufacturers Alcatel and Lucent have approved an $11 billion merger of the two companies. The new company, which will be called Alcatel Lucent, will be the world's largest telecommunications equipmen

英语听力文摘 English Digest 565、什么是儿童早衰症？

What Is Progeria? Progeria was first described in the nineteenth century. The mysterious disease is often thought of as premature aging. Children with progeria are normal for their first year of life, but then develop medical problems normally seen i

英语听力文摘 English Digest 569、为何有些狗身上有斑点？

Why Does Spot Have Spots? In dogs with multicolored coats, white areas have no pigment cells. Black, brown or yellow areas, on the other hand, get their color from special pigment cells. When a dog is just an embryo, these pigment cells travel from t

英语听力文摘 English Digest 525、对付艾滋有新招 ！

Glow In The Dark Cats, Monkeys, And HIV Have you heard the one about the jellyfish, the monkey, and the glow in the dark cat? Actually, its no joke: scientists are experimenting with ways to combat HIV and AIDS by injecting cats with genes taken from

英语听力文摘 English Digest 540、穴居人怎样抵抗疾病？

How Neanderthals Fought Disease Every year people are encouraged to get their annual flu shots. Signs are posted at drug stores and clinics. Get your shots here. Modern preventive medicine has saved millions of lives. But you may be surprised to hear

知道你的银行卡有多脏吗？

Next time you get your debit card out, you might want to use it to buy some hand wash. A study has found that nearly one in 10 bank cards contains faecal matter. Cash is little better with one in seven bank notes containing high levels of bacteria si

食品方面的词汇

A acceptable daily intake (ADI) 每人每日容许摄入量 acclimatization 气候适应 accumulate 蓄积 acetylandromedol 乙酰柽木醇毒 acceptable risk level 可接受的危险水平 acid-forming food 成酸性食品 Achromobacterium 无色菌属 Act for preventing the adulterati

英语听力文摘 English Digest 439、冬小麦

Winter Wheat According to the famous song, America is beautiful for its spacious skies, purple mountains, and amber waves of grain. If you were to make a music video based on these lyrics youd probably want mid to late summer images of fruit-laden tr

英语听力文摘 English Digest 508、昆虫也有舌头吗？

Ya?l: Somebody bought my daughter a game called Cuddies. Don: I love that game！ Y: I don't know about that. But the little plastic tongue-like part of that strange insect like body did inspire me to wonder about taste and insects. Do insects have t

英语听力文摘 English Digest 32、谁进化得更好

About six or seven million years ago chimpanzees and humans evolved from a common primate ancestor. Chimps went on to become the relatively small-brained, forest dwelling creatures we know and love. Humans went on to evolve large brains, spread throu

英语听力文摘 English Digest 26、为什么会有男人和女人？

Why are there males and females? Why are there two sexes instead of three, or twelve, or one? On todayss Moment of Science we'll learn why two is the magic number. Let's start with why there is sex at all. When two organisms reproduce sexually, sperm

英语听力文摘 English Digest 418、饮食与基因

Nutrigenomics The study of genes has shown that every individual is genetic ally unique, and this discovery leads to a host of questions as to the relationship between an individuals genes and environmental factors such as diet. That is, how does die

英语听力文摘 English Digest 356、基因也疯狂

DNA Wrath of Khan 成吉思汗疯狂的基因 Today, Afghanistan is a war-torn region, battled over by military forces and world-spanning empire s . Eight hundred years ago things were much the same. Only then, there was only one ruler: Genghis Khan.

英语听力文摘 English Digest 187、驯化狐狸

Dmitry Belyaev, Foxes, And Domestication 你与猫或狗玩耍过吗？在远古，狗对我们的祖先来说还是一种比较危险的动物呢。那么，现在为什么它们这么听话？我们的祖先又是如何驯化它们的呢？今天，就

英语听力文摘 English Digest 190、营养基因组学

Nutrigenomics 营养基因组学（nutrigenomics 或nutritional genomics，又叫营养遗传学 nutrigenetics）是研究营养素和植物化学物质对机体基因的转录、翻译表达及代谢机理的科学。 膳食是影响人体健康最重

英语听力文摘 English Digest 278、形态各异的狗

Mans Best Friendin All Shapes and Sizes Scientists are making great strides in understanding the genes that allow such a wide range of shapes, sizes and personalities in different dog breeds. Did you know domestic dogs were bred from wolves about 15,

英语听力文摘 English Digest 246、蛇的祖先

The Ancestry Of Snakes 古生物学界的一部分学者认为，蛇是由陆地蜥蜴的一个分支进化而来的，在进化的过程中，它们的脚逐渐退化消失了，而身子则变得越来越细长。另一种流行观点则认为蛇的前

英语听力文摘 English Digest 393、单亲蜜蜂王国

Fatherless Honeybee s How male honeybee s can be without fathers? The reason lies in whats called a haploidiploid system of sex determination. Approximate ly one-fifth of the animal kingdom, including ants and wasp s , use this system. What it boils