Which sentence is different in meaning from the other three?
A.A puter is a useful machine.
B.Computers are useful machines.
C.The puter is a useful machine.
D.The puters are useful machines.
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D解析分析:表示“泛指”或“类”的概念时,不仅可以用不定冠词,还可以用不带定冠词的复数形式,在一定的上下文中(不会引起误解)可以用定冠词+单数名词来表示“类”。此处A,B,C都是“类指”的意思,而D项是指“这些计算机”,是“特指”的概念。(延伸)The puter is a useful machine.是“类指”,而The puter is mine.是“特指”。