Growth of trade will depend greatly on availability of energy sources. There may still be a trillion barrels of recoverable oil in the Middle East. But the oil crisis of 1974 has 11 to renewed interest in coal and to a search for 12 sources of energy. Solar, geothermal, and nuclear energy will play a large role in the years to come.
Solar energy is available in 13 forms. Buildings can be heated and cooled by direct use of solar radiation, crops and trees, which are the most efficient converters of sunlight into energy, can be grown for their energy potential, wastes can be burned as 14 , sunlight can be converted into DC electricity, electric power can be 15 from the sun-warmed surface waters of the ocean, and lastly, solar radiation can be converted into heat that will drive electric power generators. Serious problems still remain as to 16 and storage of solar energy.
Geothermal energy is the energy contained within the earth. Heat is abundantly available deep in the earths core and is constantly being produced. However, this heat is usually located at too deep a level for 17 exploitation. In short, very little is known on the use of geothermal energy, and it has 18 been exploited.
Nuclear energy is produced in nuclear power plants. At these plants atoms of uranium are split, thus 19 masses of energy. Another source of energy
under development is the nuclear fusion of certain atoms of hydrogen. This could eventually 20 natural gas as a source of energy.
A. rarely B. transformation C. fuel D. replace
E. led F. alternative G. commercial H. briefly
I. derived J. various K. relieving L. releasing
M. transportation N. financial O. described
II. E 12. F 13. J 14. C 15. I 16. M 17. G 18. A 19. L 20. D
一篇SAT作文的实例讲解
6类SAT写作常见问题之三 表达受中文影响
SAT写作法则及实例:避免使用俚语
SAT作文名言名句
SAT写作法则及实例:文章由始至终的使用简单的语句
SAT写作:满分作文欣赏
SAT作文实例讲评
SAT作文推荐背诵范文
SAT写作的出题形式与解题技巧
SAT作文素材 爱因斯坦
SAT作文有字数的要求吗?
SAT写作素材——名人生平(4)
SAT写作法则及实例:建议不要使用的词汇
专家指点:一篇SAT作文修改与评点
SAT写作素材——名人生平
SAT写作素材——发明创造
SAT写作:做好写前准备
SAT写作:为你的论文写出一段简介(introduction)
SAT写作练习十大话题
SAT作文如何取得高分?
SAT写作素材 艺术
SAT作文的评分标准
SAT作文素材 历史与战争
SAT写作的五大基本要求
SAT写作素材——名人生平(1)
专家点评:SAT写作应避免的错误
SAT写作:认知你论文的读者和目的
SAT作文中间段修改实例讲解(一)
一篇SAT作文批改实例讲解
名词化在SAT写作中的用途
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英语试题 |
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