Besides providing a perfect environment for sea plants and animals to live in, seawater has other values, one of which is that it constantly moves, and its movements produce energy.
The most obvious movements are the waves and the tides. Winds cause the waves, and the gravitational pull of the moon and the sun causes the tides. In places like the Bay of Fundy in Canada, the difference between the high and low tide level can be as much as 40 feet.
France and Britain are now trying to use energy in the tides to produce electricity. Waves can produce electricity and some experiments are taking place to learn more about this. One of the most encouraging areas of research uses the difference between the temperature of seawater at the surface and deep down to produce electricity.
【小题1】Waves and tides are caused by .A．the same forcesB．different forcesC．their own movementsD．plants and animals【小题2】It can be inferred from the passage that .A．waves as well as the energy in the tide can produce electricityB．the highest tide is 40 feet higher than the lowest one at the seaC．many countries in the world have made the most of energy produced by seawaterD．it is being tried in some developed countries to use energy in the tides to produce electricity【小题3】 The best title for the passage is .A．Tides and WavesB．How to Produce ElectricityC．SeawaterD．Another Cheap EnergyB【小题1】D【小题1】A
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(答案→)B【小题1】D【小题1】A
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