求解GWD1-Q15
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children.In one region, agriculturists are attempting to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in beta-carotene, 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 The growing conditions required by the varieties of sweet potato currently cultivated in the region are conditions in which SPK004 can flourish.
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 There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
B说“so traditional foods would look somewhat different when prepared from SPK004”，也就是说SPK004不如以前的sweet potato，这是削弱啊。
A提供了可行性，加强。作者: DayDreamin 时间: 2012-2-29 06:53
