A:I属于芳香烃
B:II可看作醇类
C:I、Ⅱ均能发生加成反应
D:I和II互为同分异构体
①物种变化 ②人类活动 ③地壳的变动 ④海平面的升降
探究学习要求我们善于发现问题,尝试解决问题。( )
His parents were worried that he______ too much time chatting on line.