A. will provide America with about one fourth of their energy

　　B. will increase demand for energy

　　C. will make gas producers invest a big sum of money

　　D. may be influenced by the changing market prices

　　答案及解析：

　　5．D。从文章的最后一句可以得出答案。

　　B

　　The income gap between China's rural and urban residents(居民) has continued to widen during the past few years in spite of rapidly rising rural incomes, Agricultural Minister Sun Zhengcai said here on Wednesday.

　　The income ratio(比率) between urban and rural residents was 3.28：1 in 2006, against 3.23：1 in 2003, said Sun in his report on the promotion of building a new countryside in 2007. Sun also said the net income of rural residents in different regions also varied widely. The income gap is only one of several problems in rural areas, according to Sun's report. While listing the achievements in rural areas in recent years, Sun believed that rural development still followed behind urban development.

　　“We have bigger pressure to ensure the supply of major agricultural products such as grain，” he said. “China's urbanization(都市化) has been speeded up and more rural residents have gone to urban areas，” he said.

　　“In this case, more agricultural producers become farm produce consumers, which created more pressure for supply，” he said.

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