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-I think science is more useful than art.
-I disagree. I think art is            science.

---- I think science is more useful than art.
---- I disagree. I think art is _________ science.

-I think science is more useful than art.

-I disagree. I think art is            science.

A．not so useful as                         B．less useful than

C．the most useful of                       D．a(chǎn)s useful as

---- I think science is more useful than art.

---- I disagree. I think art is _________ science.