It's very important(重要的) for us to be healthy. Now I'll tell you how I can be healthy. I often eat fruit and vegetables. I don't like to eat hamburgers. They are not good for my health. I have a balanced diet. Many foods are important, such as rice, meat, eggs, vegetables and fruit. I like to eat apples. As the saying(谚语) says, “An apple a day keeps the doctor away.” And I also like doing sports. I like running in the morning. I play basketball in the afternoon with my friends. And sometimes I play ping­pong with my family at the gym on Saturdays. I think I'm healthy and strong. What about you?

对下图中甲、乙、丙、丁四幅图解释合理的是（）

①能提供呼吸的单质____；②酸：____；③不含金属元素的盐：____．

王安石变法的核心内容是

D

    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 or classmates.

    Li Wei, a junior 2 student from Hefei, could not understand his teacher and did badly in his lessons. He became so worried about it that he started to hurt himself with a knife.

    Another 14-year-old student, Yang Fang from Guangzhou, was afraid of exams. She got very nervous, and when she looked at the paper, she couldn't think of anything to write.

    In fact, many students have mental (心理的) problems. However, most of them don't ask for advice or help. Some think they will look stupid if they go to a doctor; others don't want to talk about their secrets.

    Liang Yuezhu, a teacher, has the following advice for young people:

    Talk to your parents or teachers often.

    Take part in group activities and play sports.

    Go to a doctor if you feel unhappy or unwell.