Japanese car salesmen usually do not wait at showrooms for customers to drop by; instead, （）

A．Because of science, most of the foods we eat today are contaminated.
B．It has caused a lack of information concerning the value of food.
C．As a result of scientific intervention, some potentially harmful substances have been added to our food.
D．The scientists have preserved the color of meats, but not of vegetables.

A．the attempt to fatten the animals
B．the attempt to cure sick animals
C．the using of drugs to animals
D．the using of additives to preserve the color of food

A．Drugs are always given to animals for medical reasons.
B．Some of the additives in our food are added to the food itself and some are given to the living animals.
C．Researchers have known about the potential hazards of the food additives for over thirty-five years.
D．Food may cause forty percent of cancer in the worl