The atmosphere ______ certain gases mixed together in definite proportions.
问题描述：
The atmosphere ______ certain gases mixed together in definite proportions.
A.composes of\x05\x05B.is made up\x05\x05\x05C.consists of\x05\x05\x05D.makes up of 为什么是C啊,其他几项呢不也是组成的意思吗?
答
要表示 由xx组成,compose of,consist of,make up of都是可以的,用主动形式的就只有consist of.compose of 和make up of都要用被动形式 也就是 be composed/made up of
所以这里选项只有选C了