乳发的病机是
A．肝胃湿热，火毒外侵B．肝气郁结，冲任失调C．肾气不足，肝失所养D．肝郁化火，肺阴不足E．肝火胃热，乳儿吮吸，外吹结毒
参考答案：A
____ the days he had spent with his American friends, he couldn't help_____. [ ]
A. Keeping up; smile
B. Staying up; smiling
C. Looking back on; smiling
D. Looking at; to smile
读组合体三视图的步骤有哪些？
