Only when we realize how serious the environment is damaged, _______ is usually ignored, ______ try our best to fight against it.
图中线段的条数比三角形的个数多____ .
白菜、萝卜在植物分类上都属于被子植物,你认为它们属于被子植物的主要依据是( )
服装厂用200米布做成人服装,每套大约用布3米,这些布最多能做多少套服装?