2. How do people get water to drink?
3. Why is it not safe to drink water that has been standing in lead pipes?
4. Why is the water of a well that is near a drain or a stable, not fit to drink?
5. What food do the bones need?
6. How do we get lime for our bones?
7. What is said about salt?
8. What food do the muscles need?
9. Name some flesh-making foods.
10. Why do we need fat in our bodies?
11. What is said of the fat made by alcohol?