Write ONE WORD ONLY for each answer.
Development of Pencil
History of writing instruments
product design is often the result of 31. ______
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the earliest humans used stones to draw on cave walls
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businessmen started to apply tools like sticks to write in wet clay tablets
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the early Greeks and Romans began to write with 32. ______
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then Chinese people invented 33. ______
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in the west, pens made of 34. ______ were used for 1000 years
Revolution in writing
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at first, the graphite was wrapped in 35. ______
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in 1700s, graphite was put into wooden sticks
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by 1890s, paint was applied to make pencils more attractive
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for marketing, people gave a popular 36. ______ to their pencils to promote loyalty
Modern manufacturing process
the graphite is made into a 37. ______
↓
combined with clay and shaped in rods, graphite was put in ovens to make it 38. ______
↓
the leads are dipped in 39. ______ to make it suitable for writing
↓
the wood applied to enclose the graphite is heated to remove 40. ______
答案
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