轻松学习英语第四部文本下载...
轻松学习英语第四部文本下载...
轻松学习英语第四部文本下载...
轻松学习英语第四部文本下载...
Lagos, Nigeria is already struggling with overpopulation problems. There is widespread poverty, poor sanitation, pollution and perhaps the worst traffic in the world. And the worst may be yet to come. The United Nations projects that by the year 201...
Scientists have solved the mystery behind the brilliant northern and southern light show known as Aurora Borealis. The phenomenon is caused by electromagnetic energy from the sun, which experts say also wreaks havoc on ground-based power grids and s...
By Paul Sisco Washington 05 March 2008 Hummingbirds are among the most fascinating creatures in the avian world. The male Anna hummingbird, the most common on the U.S. west coast, makes a high-pitched chirp, or screech, when it dives to guard its nes...
By Paula Wolfson Washington 2-343290 28 October 2007 The head of the U.N. atomic watchdog agency says there is still plenty of time to resolve the dispute surrounding Iran's nuclear program. VOA's Paula Wolfson reports Mohamed ElBaradei says diplomac...
By Deborah Block Washington, DC 05 May 2006 watch Civil Rights Crime report Members of the U.S. Congress are pushing for legislation that would call on the federal government to investigate the unsolv...
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