单项选择题

What are nitrates used for

A．They preserve flavor in packaged foods.
B．They preserve the color of meats.
C．They are the objects of research.
D．They cause the animals to become fatter.

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单项选择题

Which of the following statements is NOT true

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 world.

单项选择题

The FDA has tried repeatedly to control

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