people who do not get enough vitamin
People who do not get enough vitamin A in their diet may develop night blindness.But in the developing world a lack (缺乏) of vitamin A causes much more serious harm to children.According to the WHO,as many as 25,000 children die every year because of a lack of vitamin A.
One excellent source of vitamin A is found in sweet potatoes with orange flesh (采肉).Orange sweet potatoes contain high levels of beta-carotene (β胡蘿素),which the body changes into vitamin A.Ex­perts say orange sweet potatoes specially pro­duced because of growing conditions in Africa could help solve the lack of vitamin A there.
　　But,first,more people will need to be persuaded to eat them.Jan Lρw says the sweet potato needs a better image in Africa.“We do have an image problem with the sweet potato in general in Africa.” Ms.Low explains that sweet potatoes are mainly grown by poor women to feed their families in case (以防萬(wàn)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 (推銷(xiāo)) 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.Ian 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.”
71.The fIrst two paragraphs tell us that_____　A.people can‘t· see well at night without eating sweet potatoes B.lack of sweet potatoes· leads to many child deaths in Africa C.African orange .sweet potatoes are different from those in other places D.orange sweet potatoes are rich in vitamin A
72.Africans usually think that sweet potatoes______A.are food for poor people　B.don’t look beautiful in appearance C.are the main food for women　D.can’t grow well in Africa