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  • VOA标准英语2013--US Immigration Reform Faces Uncertain Future

    US Immigration Reform Faces Uncertain Future WASHINGTON Supporters of immigration reform in the United States gained a victory last week when the Senate approved a bipartisan bill which tightens border security and sets out a lengthy path for citizen...

  • VOA标准英语2011--ontrolled Time Machine Tests Prairie Fut

    Climate-Controlled Time Machine Tests Prairie Future Researchers from the University of Oregon have set up a kind of time machine to test how a warmer climate might affect grasslands and prairies around the world. Today, grasslands cover between 25 a...

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