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              聽寫填空,只寫填空內(nèi)容,不抄全文,4個單詞/詞組+1個句子,不用寫標(biāo)號~ In June 2007, a NASA spacecraft observed a large, temporary breach in Earth's magnetic field. This discovery has been helping s.
              2011-07-02 06:30
            • [英語聽力] Earth&Sky:2007地球磁力泛濫
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              2011-07-02 06:30