题目内容：

Popular culture often shows alcohol as a big part of the college experience in the United States. Television programs and movies about American college life have images of wild parties with young people either drinking alcohol or holding a drink.

Now, a new study of alcohol use suggests that some college students may be missing meals so they can have more drinks or get drunk faster. Researchers are calling this kind of behavior "drunkorexia".

The study involved 1,184 college students between the ages of 18 and 26. Researchers found that 80 percent of those studied had demonstrated some kind of drunkorexia in the past three months. They had performed heavy physical exercise, eaten low calorie meals or even missed meals for up to a full day before drinking alcohol.

Dipali Rinker organized the study and presented its findings to the Research Society on Alcoholism in June. She says students see drunkorexia as a way to keep their body weight down while drinking alcohol. And it causes them to feel the effects of alcohol quickly and with more intensity（强度）. Rinker says unhealthy eating habits are only one of the reasons why this type of behavior is dangerous. Heavy drinking is linked to drunk driving, unprotected sex, and alcohol poisoning.

George Koob, who directs a U.S. governmental agency that studies alcohol related problems, says that the percent of students using alcohol has not increased in recent years. But what worries him is that the number of students drinking to the point of "blacking out" has increased. Blacking out is when a person drinks so much alcohol they have no memory of their actions while drunk.

Koob notes that college students in Canada and Europe also face issues with alcohol. But he feels a big part of the problem is that Americans do not fully understand alcohol's effects. Most people do not know the part of the brain where decisions are made is not fully developed until age 25 and that alcohol harms the development of that part of the brain, he adds.

1.What is the purpose of the behavior "drunkorexia"?

A. To get drunk.    B. To drink more alcohol.

C. To take exercise.    D. To lose weight.

2.What can heavy drinking result in?

A. Unhealthy eating habits.    B. Drunkorexia.

C. Alcohol poisoning.    D. Quick response.

3.Which of the following is the result of blacking out?

A. Missing meals.    B. Forgetting something one did.

C. Having unprotected sex.    D. Operating a vehicle while drunk.

4.By writing the passage, the writer aims to ________.

A. show heavy drinking and its harm    B. show America college life

C. introduce American culture    D. explain harmful behaviors