The Curies are best known for their (discover) ______ of radium.

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问题 The Curies are best known for their (discover) ______ of radium.

选项

答案discovery

解析 本题考查名词的用法。留空处之前是物主代词,其后是介词短语,这说明空格处需要名词,而括号里是动词,因此须将其转化成名词discovery。
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