Ending air pollution is not going to be cheap. However, since many scientists tell us that a normal, healthy person can live about five weeks without food, and five days without water, but only five minutes without air, it may be well worth the price.
A. We can lower the price of food by going without it for five weeks.
B. A lot of money can be saved because man can live five weeks without food.
C. Ending air pollution is expensive, but it may be worth the money that we have to spend on it, because clean air is so important to us.
D. That a person can live five weeks without food shows how healthy people are.