67.This passage is mainly about .
(A)how to prepare for the SAT
(B)stress caused by the SAT　
(C)American higher education
(D)the SAT and its effects　D　Brian Walker chews pens. He bites them so hard that his boss has warned him to stop or buy his own. Kate’s weakness is more acceptable-she is unalbe to walk past a cake shop without overeating Sophin Cartier finds her cigarette habit a headache, while Alice’s thumb-sucking drives her boy friend crazy. Four people with very different habits, but they all share a common problem anxiety disorder or, in serious cases. Obessive Compulisive Disorder OCD.　From nail-biting to too much hand-washing, overeating and internet addiction（上瘾）,OCD is widespread in almost every workplace and countless home. “It is a relatively common form of nxiety,”says Dr. Mootee. “Tbe main feature of OCD is the repetitin of unwanted bosersive（过度的） thoughts such as worries that doors are left unlocked , gas or electrical appliances are left on.” In order to fight against the an esasy chedcking door locks and gas or electrical appliandces.　 Dr. Mootee says that repetitive washing, particularlu of the hands, is the most common type of OCD She hastreated many patients who wash their hands up to 30 times a day. The technique Mootee uses to treat people with OCD is called cognitive-behavioral therapy（认知行为疗法）.“It is based on the general idea that people have the ability to change the way they think and behave,”says Mootee.　But when does a haibt become a problem?“It’s personal,”says Mootee.“Everyone has something unusual,but if you can’t put up with it, then it’s a problem and you need to do something to change it.”Mootee says many people reaist for treatmet because they fear they are“crazy”. But as people become more knoledgeable about these problems they will go and get help. The only way to coure is to coqnuer.