单项选择题

The author considers it impossible to obtain no-risk food because ______.

A．no food is free from pollution in the environment
B．pesticides are widely used in agriculture
C．many vegetables contain dangerous natural chemicals
D．almost all foods have additives

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单项选择题

What is the message the author wants to convey in the passage

A．Eating and drinking have become more hazardous than be fore.
B．Immediate measures must be taken to improve food production and processing.
C．Health food is not a dream in modem society.
D．There is reason for caution but no cause for alarm with regard to food consumption.