----Must I do well in all the subjects, ...

----Must I do well in all the subjects, Mum?

----Sure, baby! As an old saying goes, knowledge is _________.

A．command

B．effort

C．power

D．energy

C 【解析】试题分析：词义辨析。A要求，命令；B努力；C权利，力量；D能量，精力；句意：—妈妈我非在所有学科中都表现很好吗？—当然。正如谚语所说：只是就是力量。根据句意说明C正确。考点：词义辨析

考点分析：

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