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    13．European botanists were very excited with the knowledgethatChina had a vast variety of plants．

    分析 欧洲植物学家很兴奋地了解到中国有各式各样的植物．

    解答 答案是that．本题考查语境中选用恰当的词或短语；题干中名词knowledge后面的从句说明了knowledge的内容，是同位语从句；从句从意思到成分都是完整的，故需要在名词性从句中不担任成分、无意义的that，答案是 that．

    点评 本题考查单词填空，做此类题目时一定要仔细分析句子结构，从语法、句意、时态等各方面判断所填词的正确形式．

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