2017届浙江省常山县高考英语一轮复习阅读理解专练：6（含答案）_高考复习指南

2017届浙江省常山县高考英语一轮复习阅读理解专练：6（含答案）

　　People who do not get enough vitamin A in their diet may develop night blindness．But in the developing world a lack of vitamin A causes much more serious harm to children．The World Health Organization links the lack of vitamin A to as many as 250．000 child deaths every year．

　　One excellent source of vitamin A is found in sweet potatoes with orange flesh．Orange sweet potatoes contain high levels of beta-carotene（胡萝卜素） ,which our body can change into vitamin A． Experts say orange sweet potatoes specially bred （育种,培植） for 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 Low with the International Potato Center, a research organization says the sweet potato needs a better image in Africa． Jan Low says,… We do have an image problem with sweet potato in general in sub-Saharan Africa． It is seen as a crop of the poor． " Ms Low explains that sweet potatoes are mainly grown by poor women to feed their families in case another crop fails． The sweet potatoes commonly grown if Africa have white or yellow flesh． But, more importantly, they are low in vitamin A．

　　Jan Low took part in a project to study how best to market orange sweet potatoes to Africans．She worked on an information campaign in Mozambique and Uganda．The campaign included radio messages about the nutritional 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, the campaigners spread the message through community theater．The performances included singing, dancing and storytelling．And everywhere they went, the campaigners wore orange T-shirts and hats．They even drove orange vehicles．Jan Low says the color made it easier to gain public attention．