单项选择题

A．How to care for precious metals.
B．A standard unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.
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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 before.
B．Immediate measures must be taken to improve food production and processing.
C．Health food is not a dream in modern society.
D．There is reason for caution but no cause for alarm with regard to food consumption.
单项选择题
What does the author think of the Americans’’ view of their food
A．They overstate the government’’s interference with the food industry.
B．They are overoptimistic about the safety of their food.
C．They overestimate the hazards of their food.
D．They overlook the risks of the food they eat.
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