7．While the history of technology can be traced along many lines，one of the most amazing development is that of photo technology，the technology of light．From the prehistoric invention of fire to laser beams （激光束） and fiber optics （光纤），light has"continually occupied the minds of inventors"．Their inventions fall into two groups：the use of light to help us see better and more interestingly，the use of light for purposes of communication．
The use of light for communicating is one of the major directions that technology has taken ever since the middle of the nineteenth century．From still photography to motion pictures to television （with a development from black-and-white to color imagery in each），photo technology has had a great effect upon mass communication and mass education．Unlike the printed words，visual images have more impact because they are more immediate．They copy reality in a way that the printed words cannot．Unlike letter shapes，they are not abstract； unlike words，they require no symbolic interpretation by the mind．Combined with the widespread and uniform spreading of such images，photo technology affects the thinking of vast audiences and shapes their view of reality．
Millions of Americans are affected by the commercially-inspired electronic manipulation （操作） of artificial images．We call it"entertainment"and can't wait to get more．
As the number of commercially available television channels grows，the viewer's freedom of choice increases，but so does the burden of that choice．Increasingly he is faced with a sea of in formation and is asked to make quick choices．
More significantly，the ease and rapidity of mass communication has created a supply of information greater than it can readily be absorbed．Flooded in the sea of information，the individual struggles to swim through it．
67．Prom the first paragraph1we can learn about the Technology of light thatD．
A．its practical use is only to enable people to see welt arid clearly
B．it achieved an amazing development in the early nineteenth century
C．its development is related to the study of the history of technology
D．it has aroused the interest of inventors ever since ancient times
68．Why do visual images differ from the printed words？Because theyD．
A．have much deeper meanings
B．enable the viewer to use his imagination fully
C．fail to produce a beneficial effect upon youngsters
D．have a greater immediate influence upon the viewer
69．According to the passage we can know thatA with the development of photo technology．
A．more and more television channels are opened
B．it takes less time for a new idea to be absorbed
C．the number of film goers has become greater
D．fewer and fewer people seem to prefer TV programs
70．The passage is mainly aboutC．
A．the history of technology
B．the speed of mass communication
C．the influence of light on communication
D．the great number of television channels．
分析 文章主要讲从远古时期开始，人们就对光充满了兴趣，随着社会的发展，光的运用可以促进人们的交流．
解答 67-70DDAC
67：D 由第一段第二句"From the prehistoric invention of fire to laser beams and fiber optics，light has'continually occupied the minds of inventors'．"可知，从远古时期开始，人们就对光充满了兴趣，故正确答案为D．
68：D 细节题．由第二段第三句"Unlike the printed words，visual images have more impact because they are more immediate．"可知，比起 printed words，visual images 的影响更大，故正确答案为D．
69：A 由文章倒数第二三段内容可知，成千上万的美国人被电子操作人工图象所带来的商机激励，产生了更多的电视频道，于是人们的选择更多了，因此A项正确，故正确答案为A．
70：C 主旨题．文章主要讲光的运用促进人们的交流，C项"光对沟通方式的影响"符合文意，故正确答案为C．
点评 1、要想做好科普英语阅读理解题，同学们就要注意平时多读科普知识类文章，学习科普知识，积累常见的科普词汇，从根本上提高科普英语的阅读能力．
2、要熟悉科普类文章的结构特点．科普类文章一般由标题（Head line），导语（Introduction），背景（Back ground），主体（Main body）和结尾（End）五部分构成．标题是文章中心思想高度而又精辟的概括，但根据历年的高考情况来看，这类阅读理解材料一般不给标题，而要同学们选择标题．导语一般位于整篇文章的首段．背景交待一个事实的起因．主体则对导语概括的事实进行详细叙述，这一部分命题往往最多，因此，阅读时，同学们要把这部分作为重点．结尾往往也是中心思想的概括，并与导语相呼应，命题者常在此要设计一道推理判断题．
3、在进行推理判断时，同学们一定要以阅读材料所提供的科学事实为依据，同时所得出的结论还应符合基本的科普常识．
