时间:2018-12-26 作者:英语课 分类:美国英语听力80篇


英语课

[00:06.48]Lack of Vitamin 1 A is the leading cause of blindness among children in deveoping countries.

[00:14.55]These children do not get enough Vitamin A in the food they eat.

[00:21.11]In Africa,more than 3,000,000 children suffer from blindness or sickness caused by lack of Bitamin A.

[00:30.17]Scientists say sweet potatoes are rich in beta carotene--the natural orange-colored substance 2 that the human body needs to produce Vitamin A.

[00:43.23]One recent study found that orange-colored sweet potatoes are an excellent food for families in southern and eastern Africa.

[00:53.89]Scientists from Kenya,Uganda and the International Potato Center in Peru 3 supervised 4 the ten-year study.

[01:03.87]The scientists found that several kinds of sweet potatoes produce excellent harvests in some areas where Bitamin A deficiency 5 is widespread 6.

[01:16.33]They said sweet potatoes provided 7 large amounts of Vitamin A at a very low cost.

[01:24.09]People in Africa liked the orange-colored sweet potatoes used in the study.

[01:30.72]Some people had thought Africans would not acceppt such potatoes because they are sweeter than locally-grown sweet potatoes.

[01:40.62]The traditional African sweet potato is white and contains little or no beta-carotene.

[01:48.98]However, research studies and taste tests showed the new sweet potatoes are able to compete with the local crops.

[01:58.26]Wanda Collins is a research official at the International Potato Center.

[02:04.94]She says the study found that mothers in Africa accepted the orange-colored sweet potatoes.

[02:13.15]Women who knew the value of these potatoes continued to buy them when food shortages 8 caused price increases.

[02:22.89]Ms.Collins says the next step is to develop this important crop in other areas of Africa.

[02:32.42]The International Potato Center reports that many women and girls in southern and eastern Africa grow sweet potatoes.

[02:42.48]The crops are grown on small pieces of land used to produce family food supplies.

[02:48.96]African farmers produce almost 7;000,000 tons of sweet potatoes each year.

[02:56.51]However, the production rate is only about five tons per hectare 9.

[03:02.36]In all developing countries, the average production rate is fifteen tons per hectare



1 vitamin
n.维他命,维生素
  • Oranges are rich in vitamin C.橙子富含维生素C。
  • Vitamin pills make up what you lack in your diet.维生素丸可补充你食物中所缺乏的营养。
2 substance
n.物质,实质,主旨
  • There isn't anything of real substance in her book.她的书中没有任何真正实质性的内容。
  • How long will the substance take to salt out?这种物质需要多长时间来盐析?
3 Peru
n.秘鲁(南美洲国家)
  • Lima is the capital of peru.利马是秘鲁的首都。
  • China and peru are friendly countries.中国和秘鲁是友好国家。
4 supervised
v.监督,管理( supervise的过去式和过去分词 )
  • The architect supervised the building of the house. 建筑工程师监督房子的施工。 来自《简明英汉词典》
  • He supervised and trained more than 400 volunteers. 他指导和培训了400多名志愿者。 来自辞典例句
5 deficiency
n.缺乏,不足,缺点,缺陷
  • During the war children suffered from a deficiency of food.战争期间孩子们遭受缺乏食物之苦。
  • Fortunately,color deficiency is not a serious medical problem.幸运的是,色盲并不是一种严重的医学问题。
6 widespread
adj.广布的,普及的,流传宽广的
  • Plastic is in widespread use.塑料已被广泛地使用。
  • English is a widespread language.英语是一种很普及的语言。
7 provided
conj.假如,若是;adj.预备好的,由...供给的
  • Provided it's fine we will have a pleasant holiday.如果天气良好,我们的假日将过得非常愉快。
  • I will come provided that it's not raining tomorrow.如果明天不下雨,我就来。
8 shortages
n.不足( shortage的名词复数 );缺少;缺少量;不足额
  • Food shortages often occur in time of war. 在战争期间常常发生粮食短缺的情形。 来自《现代汉英综合大词典》
  • At the same time, worldwide food and fuel shortages eased. 同时,世界性粮食和石油短缺的现象终止了。 来自英汉非文学 - 政府文件
9 hectare
n.公顷
  • A hectare is equal to 15 mu.1公顷合15市亩。
  • The lands were to be sold at $2.50 per hectare.土地的售价为每公顷2.50美元。
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