The paint should be mixed (A. in the proposition of ; B.out of proposition to )one part of paint to two parts of water.
出自:英语(专升本)

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