美国英语听力80篇1 Lesson20
时间：2018-12-26 作者：英语课 分类：美国英语听力80篇
[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
- 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。
- 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？
- 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。
- 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
- 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。
- 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。
- 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。