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

First we wanna talk about Hillary Clintons big night. How did it go, it will be analyzed all day long. NBCs chief White House correspondent David Gregory is here in the Convention Center and hes got more on that. David, good morning to you. Good morn

发表于:2018-12-11 / 阅读(42) / 评论(0) 分类 万花筒2008年

Want to Buy the Empire State Building? Selling the Brooklyn Bridge in New York refers to an American expression about gullible individuals who would buy it from scam artists offering bogus shares in the publicly-owned landmark. But shares in another

发表于:2018-12-16 / 阅读(51) / 评论(0) 分类 VOA标准英语2011年(十二月)

Pakistan Anti-Taliban Offensive Sparks Mass-Displacement 巴基斯坦反塔利班攻势扩大 As Pakistani forces target Islamist militants in the countrys volatile northwest, the government is attempting to accommodate hundreds of thousands of peopl

发表于:2018-12-16 / 阅读(42) / 评论(0) 分类 VOA标准英语2014年(七月)

What do we want? Safe water! When do we want? Now! West Virginians rallied out the State House in Charleston today in the wake of a chemical spill that left 300,000 people without clean water. Resident Janet Thompson told WOWKTV that he wants to see

发表于:2018-12-17 / 阅读(60) / 评论(0) 分类 2014年NPR美国国家公共电台1月

This is scientific American sixty seconds science. I'm Christopher Intagliata. Got a minute? When Pyrex cookware first came out, it was advertised as icebox to oven. Because it was made of borosilicate glass which could weather large temperature chan

发表于:2018-12-24 / 阅读(50) / 评论(0) 分类 Scientific American(九)月

By Lisa Schlein Geneva 22 March 2007 A new report says the global tuberculosis epidemic has leveled off for the first time since the World Health Organization declared TB a public health emergency in 1993. WHO's Global Tuberculosis Control report fi

发表于:2019-01-13 / 阅读(124) / 评论(0) 分类 2007年VOA标准英语(三月)

The International Committee of the Red Cross warns millions of Iraqis are at risk of disease from polluted water and inadequate health care. It says the situation of inadequate health care, water and sanitation services is particularly bad in the Ir

发表于:2019-01-13 / 阅读(56) / 评论(0) 分类 VOA标准英语2008年(十月)

Sudan is denying United Nations claims that some aid groups that were expelled from the country in March are being allowed to return by making slight organizational name changes. The groups were kicked out following the International Criminal Court'

发表于:2019-01-13 / 阅读(55) / 评论(0) 分类 VOA标准英语2009年(六月)

Kenya's government is announcing new emergency steps to address the country's growing food crisis. But critics say the government's actions are too little, too late. The emergency plan announced by the Kenyan Cabinet this week includes mobilizing th

发表于:2019-01-14 / 阅读(58) / 评论(0) 分类 VOA标准英语2009年(八月)

Africas Megacities a Major Draw for Young Up-and-Comers JOHANNESBURG, SOUTH AFRICA London. Paris. Lagos. The list of international megacities is growing, with more and more African entries on the list. Mayors from the worlds megacities met this week

发表于:2019-01-14 / 阅读(67) / 评论(0) 分类 VOA标准英语2014年(二月)

Bakken Crude Volatility, Rail Safety Scrutinized in Northern US WILLISTON, NORTH DAKOTA The U.S. department of transportation recently issued an emergency order requiring shippers of Bakken oil to ensure that the substance is properly classified prio

发表于:2019-01-14 / 阅读(77) / 评论(0) 分类 VOA标准英语2014年(六月)

Chronically Hungry Numbers Decline 全球饥饿人口呈现下降趋势 Global hunger continues to decline. About 805-million people are reported to be chronically undernourished. That's down 209-million since the early 1990s. 全球饥饿人口继续呈

发表于:2019-01-14 / 阅读(43) / 评论(0) 分类 VOA标准英语2014年(九月)

India is building new roads, airports and power plants to cater to the needs of an economy that is growing at a rapid pace. But, infrastructure continues to be woefully inadequate. 印度正在修建新的道路、机场、发电站,以满足经济高

发表于:2019-01-19 / 阅读(72) / 评论(0) 分类 VOA双语新闻 2008年5月

The old expression bird brain, referring to a small or inadequate brain sizeits not all that accurate. Take crows, for example, and other corvids, like jays and magpies. Many corvids have relatively large brains for their body size, and can do amazin

发表于:2019-01-20 / 阅读(60) / 评论(0) 分类 2016年Scientific American(十一)月

By Naomi Schwarz Dakar 19 December 2007 More than 40 people are dead and many more are missing after a fleet of boats transporting fuel to cell phone company Vodacom's local offices capsized in a river in northwestern DRC. This was the second boat ac

发表于:2019-01-20 / 阅读(76) / 评论(0) 分类 VOA常速英语2007年(十二月)

FAO: Animal to Human Disease More Likely 粮农组织警告动物来源疾病的传播 About 70 percent of the new diseases that have infected humans in recent decades have come from animals. The U.N. Food and Agriculture Organization warns its getti

发表于:2019-01-31 / 阅读(49) / 评论(0) 分类 VOA常速英语2013年(十二月)

By Barry Wood Washington 13 November 2007 With world credit markets still not functioning smoothly, experts say inadequate US regulation is largely to blame for the home loan related credit squeeze that surfaced last August. VOA's Barry Wood has more

发表于:2019-02-08 / 阅读(50) / 评论(0) 分类 VOA常速英语2007年(十一月)

Section 1 Thank you, Mr. Secretary General, for the honor to address this body once more. And thanks to the distinguished climate leaders assembled here today who are ready to take action. 谢谢秘书长先生再次给我机会让我站在这里发言

发表于:2019-02-16 / 阅读(66) / 评论(0) 分类 英语PK台

The State Department Thursday observed the 10th anniversary of the al-Qaida bombings of the U.S. embassies in Nairobi and Dar es Salaam. Secretary of State Condoleezza Rice said the twin attacks, which killed 229 people, destroyed buildings but not

发表于:2019-02-18 / 阅读(92) / 评论(0) 分类 VOA标准英语2008年(八月)