珊瑚玉簡介| 形成原因, 珊瑚玉花纹, 花型
珊瑚玉是古代珊瑚骨骼慢慢被二氧化矽取代而成,英文又叫Agatized fossil coral,就是珊瑚化石瑪瑙。珊瑚玉的花紋眾多,每個都是獨一無二。
美國公民申請資格:成為永久居民至少5年、實際居留時間(5年內在美國居住至少30個月)、在美國連續居住的時間。美國公民考試包括口說能力、英語測試、公民測驗,這邊有閱讀寫作80題庫、100 題公民測驗題庫。
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