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  3. Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design fe

Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design fe

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问题     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 from 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.
According to the passage, solar-energy systems located on Earth must store energy for which of the following reasons?
选项 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
答案A
解析 根据题干，本题正确答案应该同义改写第一句，故选项A正确。B项文中未提及。C项文中未提及。
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本试题收录于： GRE VERBAL题库GRE分类
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