4. Решение:
- A. The sidewall provides traction for the tire.
- B. Locate the load index and speed rating on the sidewall.
- A. The layers of cords in a radial tire are very strong.
- B. New tires feature diagonal tread patterns.
Ответ: 1. A. sidewall; 2. B. sidewall; 3. A. radial; 4. B. diagonal.