※ 引述《tremendous (keepgoing)》之銘言：
: 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？
答案E，現在的作物沒有含有任何SPK004缺少的營養。
光看字面實在很難發現什麼，
但取非，
現在的作物含有重要的營養是SPK004缺少的，
這樣一來改種SPK004變成顧此失彼，可以weaken。
所以E是assumption的題型概念。
答案D我也覺得可以support，可是要選most的話，E是比較適合。
有請其他強者指導一下D選項應該怎麼排除呢? 重述前提??
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