68.If a person suffers from OCD, be is likely to keep doing any of the following EXCEPT . 　
(A)chewing pens
(B)hurting himself 　　
(C)sucking fingers
(D)biting nails

细节理解题。从文中第一段以及第二段第一句话的内容，利用排除法，可以确定选项B正确。