聽1段材料，回1-5小題。
1. What makes most students sleep less than nine hours every night?
A. Watching TV.
B. Playing computer games.
C. Doing their homework.
2. Who else gives children some homework to do except their teachers?
A. Their parents.
B. Other students.
C. The children themselves.
3. Why does it take some students a lot of time to do their homework?
A. Because they are careful enough.
B. Because they are not careful enough.
C. Because they watch TV too much.
4. How many hours of sleep is good for students' health?
A. Less than 9 hours.
B. Over 9 hours.
C. Only 9 hours.
5. What would happen to a student who often goes to bed late and gets up early?
A. He would fall asleep in class.
B. He would do well in study.
C. He would have good health.
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