听一段材料，回答下面几个小题。
What's the passage mainly about?
A. Health means the absence of illness.
B. Different meanings of the term "health".
C. People's wish of a long and healthy life.
What do people nowadays think most of?
A. Medical advance.
B. Absence of disease.
C. Quality of life.
What can you infer from the passage?
A. Those who never fall ill are the truly healthy people.
B. The quality of people's lives improved greatly in the 20th century.
C. Nowadays health also means the improvement of the quality of food.