Eggs，for example，can still be eaten three to five weeks after purchase even though the use­by date is much earlier.When their use­by dates pass，strawberry­flavored drinks may lose their red color and biscuits may lose their crunch(嘎吱嘎吱的声音)，but they are not harmful.

　　“It’s a confusing subject，the difference between food quality and food safety，” said Jena Roberts，vice president of National Food Lab，a US food testing company.“Even in the food industry I have colleagues who get confused.”

　　This is why scientists are calling for a standard explanation to be printed following the use­by dates.“We want this to be clearly communicated so consumers are not misunderstanding the date and contributing to a lot of waste，” said Dana Ganders，a staff scientist with the NRDC.

　　But this won’t be a mistake that is easy to correct since people have believed it for so long.Another problem is that the quality levels of different foods change differently—some are still safe to eat long after their use­by date while others are not.

　　As a result，food industry officials are now thinking of changing the use­by date to a date indicating when food is most likely to go bad.

　　4．The use­by date was first intended to

　　.

　　A．tell the freshness of food

　　B．show the safety of food

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