people who do not get enough vitamin

题目

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胡萝素),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 (以防万一)another crop fails,so it is seen as a cr

答案

C,A