题目类型：
问答题
题目内容
more subtle, much subtle, subtler; hard, harder, hardly One of the greatest creativity killers is __________ and so deeply rooted in our culture that it is __________ noticed.
正确答案
more subtle，hardly
题目解析
第一个空用subtle的比较级，根据前后文之间的意义，第二个空是否定的副词