下列属于生命现象的是( )
A:玉米种子萌发成幼苗
B:月亮围着地球运动
C:柳枝在风中飞舞
D:蜡烛燃烧时会有蜡油
某同学用嘴对一小空瓶吸一口气,空瓶就能挂在嘴唇上,原因是( )
I think he should tell the news to his father. (改为否定句)
I ____ tell the news to his father .