In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene. Which of the following, if true, most strongly supports the prediction that the plan will succeed? A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do. B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in color and texture, so traditional foods would look somewhat different when prepared from SPK004. C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region. D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is. E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks. 答案E 大意是為改善南美某地區的維生素a不足，所以要種植可以轉換成維生素a的甜芋 spk004 提供給當地民眾，而剛好民眾的主食及農作物是甜芋，因此這個計劃可以成功 這題是GWD1-Q15的變形題 我選D，認為沒有其他品種的甜芋有更高的beta-carotene 因此種植SPK004當然會成功會 達成轉換維生素a給民眾的任務，是個很好support啊 而答案E我以為是無關選項，想不通現在種植的甜芋品種和種植SPK004的連結點，這選項為什 麼可以支持呢？ --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 60.251.224.183