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新東方優美背誦短文50篇 Unit38:Topaz38 TopazTopaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the stone “p2007-07-19 編輯：admin
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[新東方優美短文背誦] 新東方優美背誦短文50篇 Unit39:The Salinity of Ocean Wat
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[新東方優美短文背誦] 新東方優美背誦短文50篇 Unit35:Oil Refining
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[新東方優美短文背誦] 新東方優美背誦短文50篇 Unit34:Raising Oysters
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[新東方優美短文背誦] 新東方優美背誦短文50篇 Unit33:Plankton浮游生物
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[新東方優美短文背誦] 新東方優美背誦短文50篇 Unit32:Botany
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[新東方優美短文背誦] 新東方優美背誦短文50篇 Unit29:Telecommuting
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