David Beckham decided to __________ playing football match forever because he is not energetic(精力充沛的)enough.
A:put off
B:deal with
C:break off
D:give up
尿的形成是连续的,尿的排出是间断的(判断对错)
一个圆锥的体积是48立方厘米,底面积是16平方厘米,高是( )