变态
参考答案：
胚后发育过程中从幼期的状态改变为成虫状态的现象，称为变态。
— What do you think of our manager, Mr Smith?
— He is really________success in his career, but in a way he is________failure in his family. [ ]
A. a; /
B. the; the
C. a; a
D. /; /
振动器的稀油更换周期为（）小时。
A、650
B、900
C、800
