单词：biogenic chert
单词：biogenic chert 相关文章
By Peter Fedynsky Washington, DC 26 January 2006 watch Katrina Response report Hurricane Katrina rescue Senators probing the U.S. government's response to Hurricane Katrina, which devastated the city
2006年VOA标准英语（一月）
By Deborah Tate Capitol Hill 28 February 2007 The Bush administration is stepping up its campaign to get the Democratic-led Congress to approve its immigration reform plan, which failed to get approval from the Republican-dominated Congress last year
2007年VOA标准英语（二月）
By Paul Sisco Washington, DC 29 September 2006 watch Border Security Tech An immigrant captured after illegally crossing the U.S. border with Mexico It's a new approach to the crackdown. With border security and illegal immigration a major concern i
2006年VOA标准英语（九月）
By Michael Bowman Washington 29 June 2006 The Bush administration says it is taking effective steps to stem illegal immigration to the United States, but Congress must act to overhaul America's immigration system. Homeland Security Secretary Michael
2006年VOA标准英语（六月）
Semper Fi means Always Faithful. Its the motto of the Marine Corps, which is a segment of the US Navy. The Marines do whatever the federal government tells them to do, and the government always talks about how important the Marines are and how gratef
365个英语简短小故事
Whether it is mathematics or history, almost everyone has at least one subject they find to be more difficult to understand than other subjects. Some students may not be strong academically, lacking the skills they need to succeed in writing or takin
2018年VOA慢速英语(七)月
US, European Officials Renew Efforts to Fight Terror 美国与欧洲官员再度联手打击恐怖主义 U.S. Attorney General Alberto Gonzales and Homeland Security Secretary Michael Chertoff met wit
VOA2005（下）--国政军事聚焦
Homeland Security Faces Tough Questions on Katrina Response 美国土安全局在对卡特里娜飓风所伤的回应上面临严重置疑 Secretary of Homeland Security Michael Chertoff faced tough q
VOA2005（下）--国政军事聚焦
By Michael Bowman Washington 30 October 2006 The Bush administration says efforts to secure the U.S. border with Mexico are reducing the flow of illegal aliens into the country. The announcement follows President Bush's signing of a bill authorizing
2006年VOA标准英语（十月）
By Meredith Buel Washington 20 April 2006 Michael Chertoff, left, listens as Julie Myers gives remarks at Immigration and Customs Enforcement headquarters U.S. immigration agents have arrested seven e
2006年VOA标准英语（四月）
By Stephanie Ho Washington 19 February 2006 Michael Chertoff during his testimony before Senate Committee on Homeland Security and Governmental Affairs, Feb. 15, 2006 Homeland Security Secretary Micha
2006年VOA标准英语（二月）
Outgoing U.S. Homeland Security Secretary Michael Chertoff says the fact that U.S. territory has not been attacked since September 11, 2001, is the central accomplishment of his four years in office. Chertoff credits the policies of U.S. President G
VOA标准英语2008年(十二月)
Immigrants Learn English With Their Children Tha Neih Ciang is learning vocabulary words with other immigrant students. She's among four dozen Burmese youngsters at Bollman Bridge Elementary School, which is less than an hour's drive from Washington.
VOA标准英语2012年(一月)
By Peter Fedynsky Moscow 03 October 2007 October 4th marks 50 years since the former Soviet Union hurled humanity's first object into Earth orbit. It was a small round device known as Sputnik -- Russian for satellite -- with four antennas and a trans
2007年VOA常速英语（十月）
By Deborah Tate Washington 12 September 2006 Secretary Michael Chertoff The top official at the U.S. Department of Homeland Security is concerned about the possibility of an attack in the United States involving weapons of mass destruction. A day af
2006年VOA标准英语（九月）
By Peter Fedynsky Washington 15 March 2007 watch Fedynsky report Does the United States face a threat of homegrown radical Islamic terrorism? That is a question put to U.S. Homeland Security Secretary Michael Chertoff at a Senate committee hearing o
2007年VOA标准英语（三月）
By Cindy Saine Washington 08 November 2007 Homeland Security Secretary Michael Chertoff says measures, such as hiring more agents and installing hi-tech detectors, have resulted in 22 percent decrease in arrests of illegal immigrants along the southe
VOA常速英语2007年（十一月）
By Stephanie Ho Washington 10 August 2006 Homeland Security Secretary Michael Chertoff says the United States is stepping up its security measures, after authorities in Britain said they uncovered a major terror plot to blow up airplanes flying from
2006年VOA标准英语（八月）
U.S. Homeland Security Secretary Michael Chertoff says the United States sees an increasing threat of terrorist attacks coming from Western Europe. 美国国土安全部长切尔托夫说，美国注意到来自西欧地区的恐怖袭击威胁越来越
VOA双语新闻 2008年1月
Outgoing U.S. Homeland Security Secretary Michael Chertoff says the fact that U.S. territory has not been attacked since September 11, 2001, is the central accomplishment of his four years in office. Chertoff credits the policies of U.S. President Ge
VOA双语新闻 2008年12月