A．我们借助当地电台、报纸等宣传工具B．从而收到了较好的宣传效果C．在建厂头几年D．先后举办了招待会、新闻发布会、展销会等活动
参考答案：CADB
简述婴幼儿社会性微笑的发展。
I have no idea go there with her.
A．it is why that he will
B．why is it that he will
C．why it is that he will
D．it is why will he that
