发色助剂
参考答案:
为了使发色机理进一步彻底完成所使用的添加剂。
He was so _______ after he knew the ________ news.
A.excited , excited
B.exciting , excited
C.exciting, exciting
D.excited, exciting
亚洲与北美洲的分界线是( )
A.苏伊士运河
B.土耳其海峡
C.白令海峡
D.马六甲海峡