1. How many things are important for teenagers to keep fit?
2. Who needs more calories, girls or boys?
3. How much time do experts suggest teenagers spend exercising every day?
4. How will teenagers feel when they exercise?
5. What do you think is the most important thing for you to keep fit? Why?
Three.
2. Who needs more calories, girls or boys?
Boys.
3. How much time do experts suggest teenagers spend exercising every day?
At least 30 minutes.
4. How will teenagers feel when they exercise?
Relaxed.
5. What do you think is the most important thing for you to keep fit? Why?
Healthy diets. Because they provide energy.
答案：1. Three.
2. Boys.
3. At least 30 minutes.
4. Relaxed.
5. (答案不唯一，符合题意即可，示例) Healthy diets. Because they provide energy.
2. Boys.
3. At least 30 minutes.
4. Relaxed.
5. (答案不唯一，符合题意即可，示例) Healthy diets. Because they provide energy.