题目内容
18．The medicine is not a newdiscovery（discover）-it's been known about for years．分析 这种药不是新发明--已经被知晓好多年了．
解答 答案：discovery．
句中new是形容词后跟名词，a表示一种故用单数，discover是动词表发现，它的名词是discovery．
点评 根据语法功能判断出单词的词性和单复数，再根据构词法得出正确答案．
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