1、2013/4/6春季基口考试--听力下午--SpotDictation题目文本——吕梦皎发布日期：2013-04-09 2013/4/6春季基口考试--听力下午--SpotDictation题目文本Studies show farmland in Africa is often (1)_______ in important nutrients. But researchers say a combination of farming methods may help.Since the world (2)_________ seve
2、ral years ago, researchers have directed more of their (3)________ to small farms. Most farms in areas south of the Sahara Desert are only about one or two hectares. One of the goals is to (4)__________ without necessarily clearing more land to grow additional crops.Amer
3、ican researchers say that can happen with (5)__________ of an agricultural system called perenniation. It mixes food crops with trees and perennial plants – those that return (6)___________.Soil scientist John Reganold is with Washington State University.According to him
4、, one of the (7)__________ is that the soils are fairly poor in most of the regions. So how do you grow food on poor soils? There have to be food production systems that can build the soil and improve the (8)________.Mr. Reganold says poor soil may have resulted from yea
5、rs of weathering that washed away many nutrients.12 He says some farmers may have done (9)________ than good.They have been actually using (10)__________ where they’re not putting in organic matter. They’re not putting in fertilizers. They can’t afford those things. And
6、it just runs the soil down. So they’re (11)_________ the situation.He estimates that up to two billion dollars worth of nitrogen, phosphorous and potassium is lost from African soil each year.The scientist says the word perenniation defines three systems that are already
7、 used in Africa. (12)________ of the three is called evergreen agriculture. This is where farmers plant trees with their crops. John Reganold says farmers in Africa have been doing this for (13)_________, but it seems to be growing in popularity.The method is gaining (14
8、)__________ in countries such as Niger, Burkina Faso, Malawi and Zambia. 122013/4/6春季基口考试--听力下午--statem
