The mother is very glad; her baby is beginning ______.

A．understanding what she means

B．to understand that she meant

C．to understand what she means

D．noticing what she means ,

预计在2030年前，世界经济总体增长较快，但（）、化工等高耗能产业增速放缓，主要产品产最在2030年左右进入饱和，能源需求保持16%的平均增长速度。

A.钢铁

B.有色金属

C.建材

D.军工