问题补充：
-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
答案：
A. not so useful as
B. less useful than
C. the most useful of
(答案→)D. as useful as
解析：not so useful as不如……有用；less useful than不如……有用；the most useful of……中最有用的；as useful as和……一样有用。句意：我认为科学比美术更有用。——我同意。我认为美术和科学一样有用。
