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GRE阅读模拟练习题(205)

2017-05-16 16:35:00来源：网络

　　为了帮助大家练习GRE阅读题考点，新东方在线GRE频道为大家带来GRE阅读模拟练习题一文，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems. For systems transforming solar to thermal energy, the thermal energy may be stored in matter as either latent heat or sensible heat. Latent heat is absorbed or released whenever matter changes phase, as when matter changes form liquid to gas, for example, or from gas to liquid. Large heat capacities are associated with certain materials, like salts, but in any substance this storage is available only at the unique fixed temperature at which the particular phase transition occurs in that substance. Moreover, materials that have transitions at the temperatures that terrestrial solar-energy systems are likely to encounter are usually destructively corrosive at those temperatures. The storage of sensible heat, on the other hand, allows flexibility as to temperature; in addition, safe substances like water and most rocks have large sensible heat capacities.

　　1. The primary purpose of the passage is to discuss which of the following?

　　A：Reasons for the necessity for developing solar-energy systems

　　B：Different ways of storing solar energy as heat

　　C：New designs for devices that collect solar energy

　　D：Procedures for transferring thermal energy between materials

　　E：Differences between capacities of solids and liquids to store sensible heat.

　　答案：B

　　2. According to the passage, solar-energy systems located on Earth must store energy for which of the following reasons?

　　A：At any given location on Earth, the amount of sunlight available frequently changes

　　B：The operation of such systems depends on devices that require a power source other than solar energy

　　C：Demand for the energy produced by such systems varies in unpredictable ways Consider each of the choices separately and select all that apply

　　答案：A

　　3. The author suggests that which of the following constitutes a potential disadvantage of using latent heat for energy storage?

　　A：The circumstances under which phase transitions occur would limit the versatility of latent heat as a storage method.

　　B：The supply of substances that possess the properties that are needed in a medium for latent heat storage is dwindling.

　　C：The properties that are needed in a medium for latent heat storage are found in substances that have other, undesirable properties.

　　答案：AC

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