请认真阅读下面短文，从短文后各题所给的 A、B、C、D 四个选项中，选出最佳选项。
Some people like watching horror films (恐怖电影), even though the films scare them so much that they end up screaming. Why do some people love scary things? A group of scientists at the University of Pittsburgh in the US found that fear can sometimes be good for us. It can raise our mood (情绪) and help us become more confident.
In their study, 262 volunteers went into a haunted (闹鬼的) house attraction. They stayed there for 35 minutes and came across many scary things. Both before and after the experience, they reported how they were feeling.
The results showed that most of the volunteers felt happier and less anxious (焦虑的) after the experience. This has to do with dopamine (多巴胺), something that the brain produces. It makes people feel excited, and this effect can last even after the danger has passed, according to National Geographic.
What was more, being scared in a safe place could be a good way to boost (增强) our confidence, explained Margee Kerr, one of the study's authors. It made the volunteers feel confident that they could handle a scary situation in real life. It helped them deal with the fears we all have.
More than that, fear helps create strong social bonds (社会纽带). In scary situations, people are more likely to feel unsure about the future. As a result, they stick together and depend more on each other for support. Scientists call this a "tend-and-befriend system". It means in scary situations, people help their friends and make new ones, which makes them feel better and more protected. A good example of this is soldiers who fight side by side in war.
() 1. What is the study mainly about?
A. Some tips to get rid of stress.
B. The positive effects of fear on people.
C. Some effective ways to deal with fear.
D. The personality of horror film lovers.
() 2. What did the researchers find out from their study?
A. Many people find it hard to be scared.
B. People can feel excited when they are scared.
C. Happier people are likely to enjoy horror films.
D. Horror films reduce the production of dopamine.
() 3. What is Margee Kerr's opinion?
A. Being scared brings both harm and benefits.
B. We should depend on ourselves when we're afraid.
C. People won't be scared if they often watch horror films.
D. Watching horror films in a safe place makes people confident.
() 4. What can we learn from the last paragraph?
A. Fear helps bring people together.
B. Many people enjoy feeling unsure.
C. Horror films are sometimes educational.
D. Scary situations help people become smarter.