A:did he injure
B:injured him
C:was he injured
D:he was injured
下图表示某草原生态系统中部分生物能量流动图解,①~④表示相关过程能量的流动量。下列有关叙述正确的是( )
中国有句俗话叫:“伸手不打笑面人”这句话说明了( )