答题库 【开放英语4(英语II(2))-1162网上形考机考题库】 The atmosphere certain gases mixed together in definite proportions.
【开放英语4(英语II(2))-1162网上形考机考题库】 The atmosphere certain gases mixed together in definite proportions.
A. composes of
B. is made up
C. consists of
D. makes up of
