Questions 11 to 18 are based on the conversation you have just heard.

单项选择题A．It helps to keep the eyes moist.B．It helps the eyes absorb eye-drops.C．It improves a person’s concentration.D．It prevents a buildup of chemicals in the eyes.

单项选择题A．Whether it is necessary to put labels on prepared foods.B．What the daily requirements for certain nutrients should be.C．How to get consumers to read labels more carefully.D．What information food manufactures should provide to consumers.