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如果有谁没有读过此份报告,那么或者是他对报告的主题不感兴趣,或者是他对报告的结论持反对态度。如果上述断定是真的,则以下哪项也一定是真的?( )

Ⅰ.一个读过此份报告的人,一定既对报告的主题感兴趣,也对报告的结论持赞成态度。

Ⅱ.一个对报告的主题感兴趣,并且对报告的结论持赞成态度的人,一定读过此份报告。

Ⅲ.一个对报告的主题不感兴趣,并且对报告的结论持反对态度的人,一定没有读过此份报告。

A.只有Ⅰ。

B.只有Ⅱ。

C.只有Ⅲ。

D.只有Ⅰ和Ⅲ。

参考答案
正确答案:C
解析:已知:┓读过报告→(┓感兴趣∨┓赞成态度)
Ⅰ不一定真。因为根据已知条件,从“读过报告”出发并不能推出“感兴趣∧赞成态度”的结论。
Ⅱ不一定真。因为根据已知条件,从“感兴趣∧赞成态度”出发并不能推出“读过报告”的结论。
Ⅲ一定真。因为根据已知条件,从“┓感兴趣∧┓赞成态度”出发能够推出“、读过报告”的结论。
  所以,正确答案是C。
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