使用康复剂，可清除化学沉淀物、恢复毛发PH值、防止继续氧化、紧固（）、形成保护膜。
A.角质层
B.表皮层
C.发梢
D.发根
参考答案：B
His daughter is busy making _________ for the entrance examination to be held in June.
A．gifts
B．speeches
C．preparations
D．choices
试分析实际生产中禁止二次加油的利弊。
