Ms.Low explains that sweet potatoes are mainly grown by poor women to feed their families in case (以防万一) another crop fails，so it is seen as a crop of the poor.

　　Jan Low took part in a project to study how to market (推销) orange sweet potatoes to Africans.The project included radio messages about the benefits of the orange sweet potato.They advertised its ability to “fight diseases，make you strong，clear your skin and make you look healthy.” In areas without radio，they spread the message through theater.The performances included singing，dancing and storytelling.

　　And everywhere they went，they wore orange T-shirts and hats.They even drove orange vehicles.Jan Low says the color of the orange sweet potato made it easier to gain public attention.

　　Dan Gustafson heads the Washington office of the United Nations Food and Agriculture Organization.He says most of these efforts in the past failed because organizers did not consider what people wanted to eat.But Mr.Gustafson sees a better chance for the efforts to increase the popularity of the orange sweet potato in Africa.“It is because you have got advertising that I think will work.”

　　【解题导语】　在非洲，富含维生素A的有橙色果肉的红薯被人们看作是穷人的食物，一些组织正积极努力地改变人们的这种看法。

　　41．The first two paragraphs tell us that ________.

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