题目

根据括号中所给的汉语写出单词,使句子意思完整正确。 Black tea was invented in China as a way to keep tea ________(新鲜的)when it was transports long distance. 答案:答案:fresh实验室培养草履虫,发现它们都集中在培养液的上层,这说明草履虫的生活需要(  )A.充足的二氧化碳B.充足的氧气C.充足的阳光D.充足的有机物
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