4. According to paragraph 2, which of the following is true about heat reservoirs with a temperature in the range of 80° to 180° centigrade?

　　○They are under international control.

　　○They are more common than reservoirs that have a higher temperature.

　　○Few of them produce enough heat to warm large industrial spaces.

　　○They are used to generate electricity.

　　题型：细节题

　　定位词： heat reservoirs with a temperature in the range of 80° to 180° centigrade

　　解题思路：根据定位词中的数字定位到第一句话，根据意思可知在这种温度范围内地热能量的形成是最丰富的，所以B项正确。选项A、C、D的说法原文未提及。

　　重点句子翻译：

By far the most abundant form of geothermal energy occurs at the relatively low temperatures of 80oto 180o centigrade.

　　到目前为止，最丰富的地热能源的形式出现在相对较低的80度至180度摄氏温度。

　　Paragrapgh3：Geothermal reservoirs with temperatures above 180° centigrade are useful for generating electricity. They occur primarily in regions of recent volcanic activity as hot, dry rock; natural hot water; or natural steam. The latter two sources are limited to those few areas where surface water seeps down through underground faults or fractures to reach deep rocks heated by the recent activity of molten rock material. The world's largest supply of natural steam occurs at The Geysers, 120 kilometers north of San Francisco, California. In the 1990s enough electricity to meet about half the needs of San Francisco was being generated there. This facility was then in its third decade of production and was beginning to show signs of decline, perhaps because of over development. By the late 1990s some 70 geothermal electric-generating plants were in operation in California, Utah, Nevada, and Hawaii, generating enough power to supply about a million people. Eighteen countries now generate electricity using geothermal heat.

　　5. According to paragraph 3, what is the connection between underground faults and naturally occurring steam?

　　○ Underground faults enable the heat from molten-rock material to escape upward to regions where it can heat surface water enough to produce steam.

　　○ Underground faults are created by steam that is produced in geothermal reservoirs deep inside Earth.

　　○ Underground faults create spaces in which natural steam is sometimes trapped.

　　○ Underground faults allow surface water to reach deep rocks that are hot enough to turn it into steam.

　　题型：细节题

　　定位词： connection between underground faults and naturally occurring steam

　　解题思路：定位词 natural steam后面的一句话解释了两者的关系，地下断层让水通过、到达深处岩石，使其温度变高成为蒸汽，所以D项正确。

　　重点句子翻译：

The latter two sources are limited to those few areas where surface water seeps down through underground faults or fractures to reach deep rocks heated by the recent activity of molten rock material.

　　后两个能源仅限于那些地表水渗入地下断层，到达了被近期熔岩材料活动加热的深处的岩石的领域。