卫生大扫除,明明负责擦玻璃,他已经擦了 。请问:他还要擦几分之几才能全部擦完?
Our government has tried many ways to the smog(雾霾)problem. Maybe we'll have a clear sky in the near future.
下列关于哺乳动物运动系统组成的叙述,准确的是( )