合作小组讨论“生命基本特征”时,出现下面4种说法,其中正确的是( )
A:生物都能快速运动
B:生物都是由细胞组成的
C:生物都能进行光合作用
D:生物都能生长和繁殖
The boy stopped ___TV and went to do his homework when his mother came back.