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

分析 歐洲植物學(xué)家很興奮地了解到中國(guó)有各式各樣的植物．

解答 答案是that．本題考查語(yǔ)境中選用恰當(dāng)?shù)脑~或短語(yǔ)；題干中名詞knowledge后面的從句說(shuō)明了knowledge的內(nèi)容，是同位語(yǔ)從句；從句從意思到成分都是完整的，故需要在名詞性從句中不擔(dān)任成分、無(wú)意義的that，答案是 that．

點(diǎn)評(píng) 本題考查單詞填空，做此類題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)，從語(yǔ)法、句意、時(shí)態(tài)等各方面判斷所填詞的正確形式．

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