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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.

D. The varieties of sweet potato currently cultivated in the region contain some important nutrients that are lacking in SPK004.

E. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.

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原文說在

南美的部分地區(qū)，缺乏維生素A是一個(gè)很嚴(yán)重的健康問題，特別是在兒童中間。因此在一個(gè)region，農(nóng)業(yè)學(xué)家決定鼓勵(lì)弄明種一種叫做SPK004甜土豆，這種甜土豆富含B，而身體能夠把B轉(zhuǎn)換成維生素A。問哪個(gè)能支持這項(xiàng)計(jì)劃能夠成功？

A種植SPK004的環(huán)境適合種植甜土豆。直接支持。土地條件適宜，因此能夠?qū)嵤┏晒?/p>

BSPK004的肉與其他的不同，無關(guān)選項(xiàng)。原文討論的是計(jì)劃能否實(shí)施成功。

C沒有其他品種的甜土豆比SPK004富含更多的B

D目前種植的有一些營養(yǎng)是SPK004所沒有的。無關(guān)，原文focus的是維他命A，而不是其他營養(yǎng)物質(zhì)。

E其他蔬菜比甜土豆含有更多的B。E選項(xiàng)給的是weaken，不是支持。