单词：depopulations
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Todd: What do you think about the zoo? Dianna: I like to go to the zoo. I like to give all the animals names, like Bert the Giraffe, but I wish the animals didn't have to be in the zoo, but I think it is good when zoos save animals, and help to make
英语访谈对话
This is Scientific American's 60-second Science. I'm Cynthia Graber, this will just take a minute. Sex might seem like one of those little gifts from evolution. But its pretty inefficient from an evolutionary perspective. Itd be much easier to reprod
Scientific American(七)月
By Brian Wagner Miami, Florida 15 August 2007 U.S. minority population are expanding New data from the U.S. Census Bureau shows that black, Asian, Hispanic and other minority populations are expanding in many districts where whites were once dominant
2007年VOA标准英语（八月）
[00:00.40]It's becoming more and more of a problem [00:02.99]worldwide,isn't it? [00:04.33]Yes,I quite agree. [00:06.27]But noise pollution is generally [00:08.19]only a problem in urban areas. [00:10.79]This is because of increasing industrializatio
北师大版高中英语模块8(选修)
Bat Populations Still in Decline Bats are an amazingly diverse group of flying mammals that can be found in virtually every corner of the world. Because they're mostly nocturnal and a few types feed on animal blood, bats have acquired a rather dark r
VOA标准英语2011年(八月)
JUDY WOODRUFF: New HIV infections and AIDS-related deaths have fallen so dramatically in recent years that it may be possible to control the epidemic by 2030 and eventually end it altogether. That's the projection in a new U.N. report released in adv
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