A、computer failure B、leaving a paper at home C、losing a hand-held organizer D、the death of a grandmother C问题是“下面哪一个不是学生最爱用来作为学习

Here’s some bad news for students who put off studying: procrastinators get more cold and flu symptoms and have more digestive problems than their punctual classmates. They also tend toward an unhealthy lifestyle, according to a recent study of 374 undergraduates at Carleton University in Ottawa by the Procrastination Research Group.  Student procrastinators are more likely to eat poorly and smoke, and they sleep less and drink more than students who do their homework promptly.
    At the root of the problem is an inability to regulate behavior and control impulses—say, drinking more than you had intended when you sat down at the bar. "If you’re quite impulsive then you’re unable to protect one intention from another," says Timothy A. Pychyl, the leader of the Procrastination Re search Group who is also a psychologist and co-author of the study. Things can get worse when tasks are impersonal or out of one’s control. "Most assignments are not things that students initiated them selves," he says. "They can lack meaning for that reason."
    Giving a procrastinator a hand-held organizer probably won’t change habits in the long term. "It’s not about time management," Dr. Pychyl says. "Some people will buy a day planner, fill it in and say that’s it for today. It becomes part of the procrastination itself."
    Such tardiness is not unusual. In one survey, 70 percent of the students confessed to academic tardiness.  Some favorite excuses are computer failure, leaving a paper at home and the death of a grandmother.