阅读短文，选择正确答案。
Young people can have problems with their minds. Some students become worried because they have to
study very hard. Others have trouble getting on well with people like their parents and classmates.
Liu Wei, a junior 2 student from Hefei, could not understand his teacher and was doing badly in his lessons.
He became so worried about it that he started to cut his finger with a knife.
Another student, 14-year-old Yan Fang from Guangzhou, was afraid of exams. She got very worried in one
exam, and when she looked at the exam paper. She couldn't think of anything to write.
A recent report from Jiefang Daily says about 18% of Shanghai teenagers have mental problems. Their
troubles include being worried and very unhappy and having problems in learning and getting on with people.
Many students who have problems won't go for advice or help. Some think they will look stupid（silly）if they
go to see a doctor. Others don't want to talk about their secret.
Liang Yuezhu, an expert on teenagers from Beijing Adding Hospital has the following advice for teenagers:
* Talk to your parents or teachers often.
* Take part in group activities and play sports.
* Go to see a doctor if you feel unhappy or unwell.
1. Liu Wei cut his finger with a knife because ______. [ ]
A. he was afraid of his teacher
B. he wanted to frighten his parents
C. he was so worried about his studies
D. something was wrong with it
2. Yan Fang's problems happened whenever ______. [ ]
A. she studied very hard
B. she had exams
C. she talked with her parents
D. she thought of something
3. Students who have problems won't ask others for help because ______. [ ]
A. they won't let others think they are stupid
B. they don't think doctors can help them
C. they don't want to tell their secret to others
D. both A and C
4. Liang Yuezhu's advice tells us that ______. [ ]
A. it's better for the students who have mental problems to stay alone at home
B. it's unnecessary for them to be with others
C. group activities and sports can help them
D. teachers and parents can't do anything to deal with the mental problems
