Over the days，they gradually deteriorate，slowly losing some of the nutrients associated with leafy greens and fruit.By contrast，frozen vegetables and fruit are chilled(冷藏) soon after harvest and so keep higher levels of vitamins and antioxidants until they are eaten.

　　Two teams，one from Leatherhead Food Research and the other from the University of Chester，carried out 40 tests to measure nutrient levels in produce which had been sitting in a fridge for three days and the frozen equivalent (相等物)．The findings show that eating newly picked produce is the healthiest option；however，frozen food can be almost as good and is often better than items sold as “fresh”．Leatherhead’s Dr Rachel Burch said，“We must ignore the mistaken opinion that fresh food is always better for us than frozen food.”

　　These results show that frozen food can be nutritionally comparable to fresh produce.Direct comparison：In two out of three cases frozen fruit and vegetables scored better on antioxidant­type compounds including Vitamin C，polyphenols and anthocyanins (多酚和花青素)，a study found.Her team found frozen broccoli had higher levels of Vitamin C．However，fresh food scored better on polyphenols，which are thought to help prevent cancer.

　　5．What does the passage mainly tell us?

　　A．Fresh food is better than frozen food.

　　B．Frozen food might cause cancer.

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