英语听力文摘 English Digest 334、千差万别的鸟蛋

How Eggs Get Their Color 鸟蛋颜色的形成 Depending on the species, bird eggs can be any color rang ing from chickens plain white to a robins blue, streaked , spotted, bright, pale, and anything in between. We take a look at some of the reasons

英语听力文摘 English Digest 333、猫吃蜘蛛吗？

Do Cats Eat Spiders? 猫吃蜘蛛吗？ Do cats eat spiders? Our answer? Yes, they do. And thats not all cats will eat. Cats, both domestic and wild, are obligatory carnivore s , meaning that they dont have the chemical tools in their bodies to acces

英语听力文摘 English Digest 332、不明飞行物

Whats That in the Sky? 不明飞行物 In his book Cosmos , the late scientist Carl Sagan talks about the way in which the earth is regularly struck by material from outer space. These collision s with space debris can be minoras in a shooting star o

英语听力文摘 English Digest 330、近亲禁猎区

Kissing Cousins 近亲之吻 Fans of classic movies will remember the famous dueling banjo s scene in Deliverance, the story of four city friends who take an ill-fated boating trip down a backwoods Georgia river. As the friends set out, one of the fr

英语听力文摘 English Digest 329、地球上最成功的物种

The Most Successful Species on Earth 地球上最成功的物种 For many scientists, a species success is measured by sheer numbers. In that case, the most successful species known to man is a type of bacterium known as S-A-R-11, or SAR-11 for short

英语听力文摘 English Digest 328、为尿床平反

Bedtime Blues 尿床的困扰 Never a happy topic, bed wetting is a very distressing problem for five to seven million American kids. If we cant explain why some people like to pick on these kids, can we at least shed some light on what causes bed we

英语听力文摘 English Digest 327、吸血蝙蝠能挽救生命？

Bat Spit 蝙蝠的唾液 Anyone who reads gothic fiction will tell you that vampires are bad news. People who read modern medical journal s , however, might disagreein fact, they think vampires just might help save lives. The kind of vampire Im talki

英语听力文摘 English Digest 326、洋葱是宠物杀手？

Onions Are Toxic to Your Pets 洋葱是宠物杀手？ You may already know that chocolate can be lethal to your pet, but did you know that onions can be toxic to your cats and dogs too? And Im not just talking about their breath. You see all forms o

英语听力文摘 English Digest 325、树跟人类是近亲？

Is A Tree Related To Me? 树跟人类是近亲？ Last time we talked about the false belief that evolutionary theory says human beings descended from monkeys. In fact, evolution says that both human beings and monkeys descended from a common ancesto

英语听力文摘 English Digest 324、可乐的神奇清洁能力

The Cleaning Power of Soft Drinks! 饮料的神奇清洁能力 Lets begin with a cleaning tip: If you have some tarnished or corroded brass that you want to clean, an old brass candlestick for example, you can use Coca-Cola, or any other cola soft dr

英语听力文摘 English Digest 323、荡秋千的精彩

Swinging Physics: Potential And Kinetic Energy Working Together 动能与势能相互作用 动能是所有能看到的运动的能量，包括物体的，微粒的或质点集的运动等。 势能(Potential energy )是位置的函数，例如把一个

英语听力文摘 English Digest 322、睡不着？暖暖手吧！

Cant Sleep? Warm Your Hands! 睡不着？暖暖手吧！ Ya?l: You okay, Don? Don: Sorry,Ya?l . I've been having trouble sleeping lately. Y: Have you tried thinking warm thoughts about your hands and feet? D: Uh,No. Why would I wanna do that? Y: Beca

英语听力文摘 English Digest 321、鸟儿捕虫的法宝

How Do Robins And Other Birds Find Worms? 鸟儿捕虫的线索 Everyone is familiar with the sight of robins hopping around the yard, peering into the grass or head-cocking to locate a nice juicy worm. In no time, they find their prey and fly off wi

英语听力文摘 English Digest 320、南极地衣

南极地衣 南极地衣是地球上最古老的植物之一，是一类原始型的低等植物，它能适应南极洲那种沙漠般的干燥和极度寒冷的环境，所以它是分布最广、种类最多的南极土著植物。它主要分布于

英语听力文摘 English Digest 319、储存食物的动物

Food Caching 食物储存 Humans may be one of the smartest animals on the planet, but when it comes to remembering where things are, Clarks nutcrackers have us beat. A relative of jays and crows, nutcrackers hide pine seeds in the ground each autumn

英语听力文摘 English Digest 318、无糖可乐的奥秘

How Do You Make A Diet-Coke Float? 你能让无糖可乐浮起来吗？ Heres an at-home experiment you can try. Take a can of classic Coca-Cola and a can of Diet Coke, and without opening either one submerge them in water. A deep sink or a bucket wi

英语听力文摘 English Digest 317、灰蝶与蚂蚁双赢原则

灰蝶与蚂蚁双赢原则 The Special Relationship Between Ants and Lycaenid Butterflies The Lycaenids are a group of butterflies known commonly as blues, coppers and hairstreaks. Most species of Lycaenid butterflies have evolved close, mutually- b

英语听力文摘 English Digest 331、洗手误区

Dirty Hands 洗手误区 Most people believe that regular hand-washing is the best way to prevent infection s . And theyre right: hand-washing does prevent certain infection s , but too much washing can actually help some infection s along.Whats goin

英语听力文摘 English Digest 316、罐装食品膨胀的原因

What Causes A Can Of Food To Swell? 罐装食品膨胀的原因 Most of us are cautious eaters. If youre munching grapes, youll probably skip one thats all shriveled and discolored in favor of the round, healthy ones. Likewise, when you choose a can

英语听力文摘 English Digest 315、脑白金到底是什么？

脑白金到底是什么？ 褪黑素，又名黑素细胞凝集素，俗称为脑白金，是存在于从藻类到人类等众多生物中的一种荷尔蒙，它在生物中的含量水平随每天的时间变化而变化。 Melatonin, sometimes ca