Marconi's conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it has become precisely the opposite, a tool for communicating with a large, public audience.


Marconi's conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it has become

Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become

考题讲解

题目分析:
A选项是一个系表结构,as a substitute for the telephone是Marconi’s conception of the radio的表语。在语法上,表语也称为主语的补语,在解释说明主语。因此,本选项的意思是:“M对于收音机的概念”是“电话的替代品”。但是,在逻辑上这是不正确的。因为,真正“是”电话的替代品的应该是“收音机”,而不是某人对收音机的概念,即,应该写为:
Marconi conceived of the radio as a tool for private conversation. 
此时,as a tool for private conversation做宾语的补语,其表示the radio和a tool for private conversation之间是“是”的关系,这是因为,例如:
I put the book on the table.
划线部分也是宾语(the book)的补足语。观察例句可知,宾语the book和补语on the table之间是“是”的关系,即,the book is on the table。例句表示,我“令”书具有在桌子上这一状态。

因此,答案为(B)。

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