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

---- 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. as useful as

A. not so useful asB. less useful thanC. the most useful of(答案→)D. as useful as解析：第一人认为科学比艺术有用些，第二个人不同意。A,B都是说艺术不如科学，跟第一人讲的一样，故都不对。这里两者相比，故不能用最高级。D用的是as…as结构，表示“和…一样”，选D。第二个人认为艺术和科学一样有用。

这个答案应该是对的