9.听第10段材料,回答第17至20题.
17.Why do teenagers go to their friends for help?
A.Their parents are too strict to them.
B.They often quarrel with their brothers or sisters.
C.They feel their friends know them better than their parents.
18.What is important in children's growing up?
A.Getting together with their friends.
B.Talking with their friends on the phone.
C.Both A and B.
19.What is the speaker's attitude towards choosing friends?
A.Parents should choose friends for their children,
B.Children have the right to choose their own friends.
C.The writer leaves the question of choice for us to think of.
20.What's the speaker mainly talk about?
A.Teenagers'attitude towards friendship.
B.The way of making friends.
C.The importance of friendship.