题目

The Princess and the Frog is a fairy music that ____ the days when Walt Disney was a person，not a brand． （ ） A．was dated back to    B．has been dating from C．dates back to     D．had dated from 答案：C氢氧化钠有很强的 ，所以使用时应特别注意，避免沾在衣服或皮肤上．它不仅能吸收空气中的  而潮解，还能与空气中的  反应变质．