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礦物燃料是由動(dòng)植物的遺體經(jīng)過(guò)數(shù)百萬(wàn)年腐化而來(lái)的。Hints:methane "proved reserves" the Appalachian Mountains MichiganMany people think the search for cleaner energy leads only to renewable resources...

傳奇歌手貝芙莉•希爾(2)

四、五十年代的美國(guó)，貝芙莉·希爾是婦孺皆知的大眾明星Sills passion for the arts never faded, even after her retirement from the stage in 1980. She became one of the most influential and successful

傳奇歌手貝芙莉·希爾(1)

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