问题补充：
As we all know, water hydrogen and oxygen.
A. makes up
B. is consisted of
C. consists of
D. consists in
答案：
A. makes up
B. is consisted of
(答案→)C. consists of
D. consists in
解析：考查词组辨析：句意：我们都知道，水是由氢气和氧气组成的。 makes up组成，被动是be made up of，排除A， consistof组成，没有被动式，排除B， consists in在于，意思不对。选C。
