（）有利于肠道消化吸收，还能定时大便。
A.定时运动
B.定时喂养
C.定时入睡
D.定时起床
参考答案：B
Only when I read the Frog by Moyan a second time _________ to appreciate his magic realism.
A．did I begin
B．I began
C．had I begun
D．I have begun
纺织、采掘、冶金等企业属于( )。
A．大量生产 B．单件生产 C．成批生产 D．多步骤生产
