阅读理解

　　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, a Junior 2 student from Hefei, could not understand his teacher and was doing badly in class. He became so worried about it that he started to cut his finger(手指) with a knife.

　　Another student, l4-year-old Yan from Guangzhou, was afraid of exams. She got very worried in one, 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 teens have mental(精神) problems. Their troubles include(包括) 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(劝告) or help. Some think they will look stupid(愚蠢) if they go to see a doctor. Others don't want to talk about their secret.

　　Liang Yuezhu, an expert(专家) on teenagers from Beijing Anding Hospital, has the following advice for teens:

　　*Talk to your parents or teachers often

　　*Take part in group activities(活动) and play sports

　　*Go to see a doctor if you feel unhappy or unwell

根据短文内容，回答问题

1．What is wrong with some students?

2．Why did Liu cut his finger with a knife?

3．When did Yan's problem happen?

4．Why won't students who have problems go for advice or help?

5．Please express(表达) Liang's advice in your own words.

　　I want ________　________　an ________ student in America.