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(673) / 评论(0) 分类 新概念优美背诵短文50篇

GLIMPSES OF AUSTRALIA AUSTRALIA Capital: Canberra Offcial name: Commonwealth of Australia Area: 7,686,850 km2 Population: 20 million Highest point: Mount Kosciuszko, 2,228 metres above sea level Lowest point: Lake Eyre, 15 metres below sea level Aus

发表于:2018-12-04 / 阅读(182) / 评论(0) 分类 高中三年级英语

Thank you very, very much, President Keohane. Mrs. Gorbachev, Trustees, faculty, parents, and I should say, Julia Porter, class president, and certainly my new best friend, Christine Bicknell -- and, of course, the Class of 1990. I am really thrille

发表于:2018-12-04 / 阅读(118) / 评论(0) 分类 名人演讲

孟加拉国恐怖袭击肆虐 Increasingly sophisticated terrorist attacks in Bangladesh have targeted foreigners, secular bloggers and other activists, as well as members of religious minorities. It is a worrying development in a Muslim country kno

发表于:2018-12-08 / 阅读(63) / 评论(0) 分类 VOA标准英语2016年(八月)

After a more than twenty-year delay by successive administrations, President Donald Trump has finally made good on the promise to recognize Jerusalem as the capital of Israel. He also directed the State Department to begin preparations to move the Am

发表于:2018-12-08 / 阅读(75) / 评论(0) 分类 VOA标准英语2017年(12月)

You are on Just One Thing today. Come on over this way. Dr. Lawrence Rosen is with us this morning. And let's just talk a little bit about allergy season because he is the pediatric columnist for Kiwi magazine. And now April, the worst month for alle

发表于:2018-12-11 / 阅读(85) / 评论(0) 分类 访谈录2010

Chloroform Poisoning Might Have Killed Odessa Activists 敖德萨活动人士或许死于氯仿中毒 ODESSA, UKRAINE Ukraine's government says 32 pro-Russian activists who died during a fire in a building they had taken over early this month in Odes

发表于:2018-12-16 / 阅读(56) / 评论(0) 分类 VOA标准英语2014年(五月)

This is Scientific American 60 second Science, I am Sophie Bushwick, Got a minute? Sharing is one of the hallmarks of human behavior: give me a cookie and Im more likely to give you one later. But our bonobo cousins have an odd variation on the pract

发表于:2018-12-24 / 阅读(78) / 评论(0) 分类 Scientific American(一)月

Wolves Need More Room to Roam狼群需要更多生存空间 Wolves are vital players in various ecosystems. So we humans need to develop a better tolerance for wolves. And the wolves need more space. Thats according to a new study in the journal Natu

发表于:2018-12-24 / 阅读(57) / 评论(0) 分类 2017年Scientific American(六)月

Figure Skaters Do Get Dizzy Have you ever wondered how figure skaters spin so many times without getting dizzy? Figure skaters do experience dizziness, but they have a few different ways to conceal their feeling, and to stay upright after their rotat

发表于:2018-12-28 / 阅读(49) / 评论(0) 分类 趣谈英语

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(70) / 评论(0) 分类 考研背诵50篇

On his recent trip to the Middles East, U.S. Secretary of State Mike Pompeo made clear that Saudi Arabia's security is a priority for the United States. 近日,在出访中东期间,美国国务卿蓬佩奥(Mike Pompeo)明确表示,保证沙特的

发表于:2019-01-03 / 阅读(94) / 评论(0) 分类 VOA标准英语2018年(五月)

Hurricane Katrina rescuer is among those recognized Mohamed ElShinnawi | Washington, DC 20 May 2010 Chicago Mayor Richard Daley (left) was honored for his efforts to promote better relations between the US and the Arab world. For the past 12 years, L

发表于:2019-01-08 / 阅读(92) / 评论(0) 分类 VOA标准英语2010年(五)月

By Lisa Schlein Geneva 13 October 2007 The Human Rights Committee of the Inter-Parliamentary Union says the cases of more than 250 parliament members in 32 countries who have been imprisoned, killed or disappeared remain unresolved and continue to be

发表于:2019-01-11 / 阅读(98) / 评论(0) 分类 2007年VOA常速英语(十月)

By Bill Rodgers Washington 19 May 2008 The Green Revolution is a good example of how technological advances can have a dramatic effect on economic development - in this case on food production. Other technological innovations are helping to improve a

发表于:2019-01-13 / 阅读(66) / 评论(0) 分类 VOA标准英语2008年(五月)

Russian Laws Keep Gay Life Behind Closed Doors When gay rights activists recently released a rainbow of balloons from a Saint Petersburg park, the predictable happened. City police herded activists into a waiting bus. Then, black-shirted nationalists

发表于:2019-01-13 / 阅读(57) / 评论(0) 分类 VOA标准英语2012年(七月)

Three candidates in the Afghan presidential election, including incumbent President Hamid Karzai, have faced off in a nationally broadcast debate. It was the first time a sitting president has participated in such an election debate. An Afghan girl

发表于:2019-01-14 / 阅读(65) / 评论(0) 分类 VOA标准英语2009年(八月)

UN Peacekeeper Immunity Challenged 联合国维和人员豁免权受到挑战 A new initiative has been launched to block U.N. peacekeepers from being granted immunity when accused of sexual exploitation and abuse. At least 50 such alleged incidents

发表于:2019-01-14 / 阅读(57) / 评论(0) 分类 VOA标准英语2015年(五月)

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(78) / 评论(0) 分类 2018年科学美国人3月

Jim: You know that religion is a taboo subject, especially with Paul. Why were you baiting him all through dinner? Tammy: I wasnt baiting him. We have very different views on spirituality and I wanted to discuss the subject with him. Jim: You were ma

发表于:2019-02-17 / 阅读(67) / 评论(0) 分类 地道美语播客