A:①②③
B:②③④
C:①②④
D:①③④
下列关于世界人口、语言和宗教的叙述正确的是( )
现有化学药品:锌、稀硝酸、浓硫酸、盐酸、苛性钠、生石灰、纯碱.能与锌、纯碱保存在同一药橱中的是 ( )
____ ____ often ____ to the park at weekends?
—Don't do any other things while you are having a class. So please _______ your MP3.
—Sorry, I will do it right now.