单词:
单词: 相关文章
Three centuries later, shortly before the birth of Christ, Egypt was still ruled by a living goddess, Cleopatra, a Greek 1) descended from one of Alexander’s generals. She looked back to the Golden
Mosquitoes, Not Birds, Made West Nile National In 1999 West Nile virus infected its first American, in New York. By 2004, the disease had spread across the country. Researchers speculated that, for the disease to spread so far so quickly, birds must
By David McAlary Washington 16 May 2007 Scientists say West Nile virus is killing large numbers of birds across North America. The organism has devastated big proportions of several bird species that commonly populate town and city suburbs throughout
A study in rural Nepal found a greater chance that babies would survive their first month. Transcript of radio broadcast: 08 July 2008 This is the VOA Special English Health Report. A new study in rural Nepal shows the value of washing hands with so
This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? If you're worried about news reports of West Nile virus, you might want to go take a census of the birds in your backyard. Because certain species of birds actually
by Jill Moss Broadcast: July 23, 2003 This is Bill White with the VOA Special English Health Report. A medical company in Australia, PanBio, has developed a new test for West Nile 1)virus. The test ex