标题: GRE北美真题系列(一)D [打印本页] 作者: monday1 时间: 2008-7-29 16:36 标题: GRE北美真题系列(一)D 26. According to the passage, if the average geothermal gradient in an area is 22℃ per kilometer of depth, which of the following can be reliably predicted?
Ⅰ.The temperature at the base of a 10-kilometer well will be sufficient for the production of electricity.
Ⅱ Drilling of wells deeper than 10 kilometers will be economically feasible.
Ⅲ Insufficient water is present to produce eruptive phenomena
(A) Ⅰ only
(B) Ⅱ only
(C) Ⅰ and Ⅱ only
(D) Ⅱ and Ⅲ only
(E) Ⅰ.Ⅱ. and Ⅲ
27. Which of the following would be the most appropriate title for the passage?
(A) Energy from Waters Sources: The Feasibility of Commercial System
(B) Geothermal Energy Retrieval: Volcanic Activity and Hot Dry Rocks
(C) Energy Underground: Geothermal Sources Give Way to Fossil Fuels
(D) Tappable Energy for America's Future: Hot Dry Rocks
(E) High Geothermal Gradients in the United States: Myth or Reality?