【正文】 extended food choices by bringing cattle, pigs, goats, and sheep to the island. Africans also added to the island39。s all around you. If you want this hightech wonderstuff, all you need is a pencil, paper and a little adhesive tape. Use the pencil to shade a small area on the paper, and then apply a small piece of adhesive tape over the area. When you pull up the tape, you39。s so thin that you would need to stack about 25,000 sheets just to make a pile as thick as a piece of ordinary white paper. If you were to hold a sheet of graphene in your fingers, you39。ve turned their eyes to graphene, a superthin material, made of carbon, that could change the future of electronics. This year39。 Learn about Light 1 Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless, tiny particles that enter the human eye and create what we call vision. However, Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them, light spread out and travelled like a straight line. This theory was accepted during the 19th century. 2 ln 1905, Albert Einstein published a research paper in which he explained what is referred to as the photoelectric effect. This theory explains that particles make up light. The particles Einstein was referring to are weightless bundles(束 )of electromagic(電磁 )energy called photons(光子 ). Today, scientists agree that light has a dual(二重 ) nature — it is part particle and part wave. It is a form of energy that allows us to see things around us. 3 Things that give off light are known as sources of light. During the day, the primary source of light is the sun. Other sources of light include stars, flames, flashlights, street lamps and glowing gases in glass tube. 4 When we draw the way light travels we always use straight lines. This is because normally light rays travel in a straight line. However, there are some instances that can change the path and even the nature of light. They are reflection, absorption, interference (干擾 ), etc. 5 Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel(旋轉齒輪 )between the beam and the mirror. From the rate of rotation of the wheel, number of wheel’s teeth and distance of the mirror, he was able to calculate that the speed of light is 313 million meters per second. In a vacuum(真空 ),however, the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane. 23. Paragraph 2 ___A___ 24. Paragraph 3 ___B___ 25. Paragraph 4 ___D___ 26. Paragraph 5 ___C___ A. How is the nature of light explained today? B. What are sources of light? C. How did physicists measure the speed of light? D. How does light travel? E. How did people think of light years ago? F. What causes a shadow? 27. Objects are visible to the human eye as light is __F____ 28. Stars, flames, flashlights are some examples of ___A___ 29. Some instances such as reflection and absorption can change ___C___ 30. Hippolyte Fizeau conducted an experiment to measure ___B___ A. sources of light B. the speed of light C. the path of light D. a straight line E. a beam of light F. a form of energy 第四部分：閱讀理解 (第 31~45題 ，每題 3分，共 45分 ) 下面有 3篇短文，每篇短文后有 5道題。如果該句的信息文中沒有提及，請選擇 C。2020年 職稱英語考試 理工類 C 級試題及參考答案 第一部分：詞匯選項 (第 1~15題，每題 1分，共 15分 ) 下面每個句子中均有 1個詞或者短語有括號，請為每處括號部分確定 1個意義最為接近的選項。如果該句提供 的是錯誤信息，請選擇 B。(2)第 27~30題要求從所給的 6個選項中為每個句子確定一個最佳選項。s Superstrength Big technology es in tiny packages. New cell phones and personal puters get smaller every year, which means these electronics require even smaller ponents on the inside. Engineers are looking for creative ways to build these ponents, and they39。s the thinnest possible material in this world. says Novoselov. He calls it a wonder material. It39。t have to look far to find graphene— it39。ve found graphene. 31. What would change the future of electronics according to engineers?( C ) A. Personal puter. B. Big technology. C. Graphene. D. Creative ways. 32. Which of the following statements about graphene is true ?( B ) A. It is visible to the human eye. B. It is possibly the thinnest material in the world.