英语自学网 发表于 2016-8-2 13:21:55

【TOEFL核心词汇】No.113 出现

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只听写例句。前面的单词不用听写。http://t1.g.hjfile.cn/listen/201212/201212240105014064071.mp3An environment favorable to the growth and later preservation of organisms is required for the occurrence of fossils.
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