The atmosphere _______ certaigases mixed together idefinite proportions.
·composes of
·is made up
·consists of
·makes up of
出自:个案工作

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块