TPO71阅读真题+题目+答案下载：Electrical Energy from the Ocean

TPO71阅读真题+题目+答案下载：Electrical Energy from the Ocean

[Paragraph 1]Solar energy reaching Earth is responsible for differential heating of the atmosphere and thus air circulation as wind. Some of the energy of wind is transferred to the oceans, where it causes waves and is partly responsible for oceanic currents, although Earth's rotation also plays a role in currents Gravitational attraction between Earth and the Sun and Moon generates tides and, along with Earth's rotation, causes most coastal areas to experience a twice-daily rise and fall of sea level In short, the oceans possess a tremendous reservoir of largely untapped energy.

[Paragraph 2]If we could effectively harness the energy possessed by the oceans, an almost limitless, largely nonpolluting energy supply would be ensured. Unfortunately, ocean energy is diffuse, meaning that the amount of energy for a given volume of water is small and thus difficult to concentrate and use. Several ways of using ocean energy are being considered or are under development, and one is currently in use, although it accounts for only a tiny proportion of all energy production. Of the several sources of ocean energy—temperature differences with depth, currents, waves, and tides—only the last shows much promise for the near future

[Paragraph 3]Ocean water at depth might be as much as 25°C colder than surface water, a difference that allows for ocean thermal energy conversion (OTEC). OTEC exploits this temperature difference to run turbines and generate electricity. The amount of energy available is enormous, but a number of practical problems must be solved before it can be used For one thing, any potential site must be close to land and also have a sufficiently rapid change with depth to result in the required temperature difference. Furthermore, enormous quantities of warm and cold seawater would have to circulate through an electrical-generating plant, thus requiring that large surface areas be devoted to this purpose.

。。。。余下托福PO71阅读真题Electrical Energy from the Ocean省略！

1、(单选题) According to paragraph 1, both wind energy and the rotation of Earth contribute to the creation of

A.waves

B.oceanic currents

C.a gravitational attraction between Earth and the Sun and the Moon

D.tides

2、(单选题) The word "harness" in the passage is closest in meaning to

A.put into use

B.separate out

C.come to understand

D.identify the location of

3、(单选题) According to paragraph 3, the concept of OTEC is tied to which of the following aspects of the ocean?

A.Deep waters of the ocean are often calmer than surface waters are

B.Enormous amounts of water are available below the surface of the ocean

C.Temperatures beneath the ocean s surface water can vary greatly according to the depth of the water

D.Waves and tides contribute to forming land sites that are ideal for running turbines and generating electricity

。。。。余下托福PO71阅读真题Electrical Energy from the Ocean题目省略！

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