Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C;a departure of a few

发表于:2018-11-27 / 阅读(670) / 评论(0) 分类 新概念优美背诵短文50篇

The dog barks. It likes to bark. The bird sings. It likes to sing. The dog and bird are noisy. The cat meows. It meows when it is hungry. It meows when it is angry. The fish says nothing. The turtle says nothing. The mouse says nothing. The lizard sa

发表于:2018-12-06 / 阅读(66) / 评论(0) 分类 汪培珽儿童英文分级书单三 An I can read

This is Whats Trending Today. A first-round tennis match at the Miami Open in Florida was delayed on Wednesday due to a surprise visitor. Jiri Vesely from the Czech Republic was playing against Tommy Haas of Germany when he noticed an iguana. The lar

发表于:2018-12-07 / 阅读(57) / 评论(0) 分类 2017年VOA慢速英语(三)月

Mike Perham was only 16 years old when he set off on a quest to become the youngest sailor to circumnavigate the globe. Starting at Lizard point off the English coast, he sailed around the southern tip of Africa, crossed the south seas of the Pacific

发表于:2018-12-11 / 阅读(72) / 评论(0) 分类 万花筒2009年

AZUZ: Bo, Barney, Socks, Millie, Lucky, Grits they were all members of the U.S. government, but neither elected nor appointed. They were the adopted first dogs of U.S. presidents. Teddy Roosevelt practically had a zoo. His family entered the White Ho

发表于:2018-12-15 / 阅读(81) / 评论(0) 分类 美联社新闻一分钟2017(八)月

LULU GARCIA-NAVARRO, HOST: The once-green hillsides of Puerto Rico are now brown. Hurricane Maria stripped bare the lush forests of the island. While it may look depressing in the near term, NPR's John Burnett reports the forests will likely recover.

发表于:2018-12-17 / 阅读(58) / 评论(0) 分类 2017年NPR美国国家公共电台10月

AZUZ: Bo, Barney, Socks, Millie, Lucky, Grits they were all members of the U.S. government, but neither elected nor appointed. They were the adopted first dogs of U.S. presidents. Teddy Roosevelt practically had a zoo. His family entered the White Ho

发表于:2018-12-20 / 阅读(53) / 评论(0) 分类 CNN美国有线新闻2017年8月

adder n. 蝮蛇 analysis n. 分析 arsenic n. 砒霜 carnivore n. 食肉动物 cobra n. 眼镜蛇 concoct v. 调制 conversion n. 转变 defy v. 使不可能 digestive adj. 助消化的 fierce adj. 凶猛的 haemolytic adj. 溶血性的 lizard n. 蜥蜴

发表于:2018-12-24 / 阅读(87) / 评论(0) 分类 新概念英语第四册单词MP3

Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C; a departure of a few

发表于:2018-12-30 / 阅读(65) / 评论(0) 分类 考研背诵50篇

US Conservation Program Teaches Teens about Nature 美国自然保护计划教导青少年自然知识 MURRIETA, CALIFORNIA Teenagers have been removing invasive plants and protecting endangered species around the United States this summer, in a prog

发表于:2019-01-14 / 阅读(61) / 评论(0) 分类 VOA标准英语2014年(八月)

AUDIE CORNISH, HOST: Sometimes good research can get done with a tool so simple a child could do it. For instance, scientists around the world recently set out thousands of fake caterpillars made from clay. NPR's Nell Greenfieldboyce explains why. NE

发表于:2019-01-17 / 阅读(43) / 评论(0) 分类 2017年NPR美国国家公共电台5月

Various animals evolved coloration that keeps them hidden. A jaguar's patterns help it slink undetected across the sun-dappled rainforest floor. The mottled pigmentation on the wings of some let them rest on tree bark undisturbed. And then there are

发表于:2019-01-20 / 阅读(69) / 评论(0) 分类 2016年Scientific American(九)月

Its reputation for violence and terror is unmatched, but an infant T-Rex comes into the world better protected than most. If you say Tyrannosaurus Rex, I think of gentleness. I think of superb motherhood and a struggle to raise ones chicks. The dread

发表于:2019-01-23 / 阅读(39) / 评论(0) 分类 探索与发现2013年

Tyrannosaurus Rex was of ten thousand pound, self-propelled, antitank weapon. Now, sixty five million years later, cutting-edge imaging technology lets us look deep inside their bodies to reveal just how the worlds greatest carnivores really work. Di

发表于:2019-01-23 / 阅读(44) / 评论(0) 分类 探索与发现2013年

Cold Snap Shapes Lizard Survivors In January 2014, an epic cold wave swept across the southeasta snowpocalypse so severe that thousands of drivers in Atlanta abandoned their cars on icy highways and Interstates. 在2014年1月,一场被称为末日暴

发表于:2019-02-14 / 阅读(68) / 评论(0) 分类 2018年科学美国人3月

Hi there, I'm Ricky from the BBC World News for Children. It's Thursday the 10th of June. Coming up: Pop star Shakira's set to kick off the World Cup. South Korean rocket has 'exploded'. And the technology that allows students to sit exams at home. F

发表于:2019-02-24 / 阅读(59) / 评论(0) 分类 英语听力文摘 English Digest

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

发表于:2019-03-09 / 阅读(111) / 评论(0) 分类 英语听力文摘 English Digest