問題詳情

Questions 1-9Glass fibers have a long history. The Egyptians made coarse fibers by 1600 B.C., andfibers survive as decorations on Egyptian pottery dating back to 1375 B c. During theRenaissance (fifteenth and sixteenth centuries A.D.), glassmakers from Venice used glassLine fibers to decorate the surfaces of plain glass vessels. However, glassmakers guarded their(5) secrets so carefully that no one wrote about glass fiber production until the earlyseventeenth century.The eighteenth century brought the invention of "spun glass" fibers. Rene-Antoine deReaumur, a French scientist, tried to make artificial feathers from glass. He made fibersby rotating a wheel through a pool of molten glass, pulling threads of glass where the hot(10) thick liquid stuck to the wheel. His fibers were short and fragile, but he predicted thatspun glass fibers as thin as spider silk would be flexible and could be woven into fabric.By the start of the nineteenth century, glassmakers learned how to make longer, strongerfibers by pulling them from molten glass with a hot glass tube. Inventors wound thecooling end of the thread around a yarn reel, then turned the reel rapidly to pull more fiber(15) from the molten glass. Wandering tradespeople began to spin glass fibers at fairs, makingdecorations and ornaments as novelties for collectors, but this material was of littlepractical use; the fibers were brittle, ragged, and no longer than ten feet, the circumferenceof the largest reels. By the mid-1870's, however, the best glass fibers were finer than silkand could be woven into fabrics or assembled into imitation ostrich feathers to decorate(20) hats. Cloth of white spun glass resembled silver; fibers drawn from yellow-orange glasslooked golden.Glass fibers were little more than a novelty until the 1930's, when their thermal andelectrical insulating properties were appreciated and methods for producing continuousfilaments were developed. In the modern manufacturing process, liquid glass is fed(25) directly from a glass-melting furnace into a bushing, a receptacle pierced with hundredsof fine nozzles, from which the liquid issues in fine streams. As they solidify, the streamsof glass are gathered into a single strand and wound onto a reel.
1. Which of the following aspects of glassfiber does the passage mainly discuss?
(A) The major developments in itsproduction
(B) Its relationship with pottery making
(C) Important inventors in its long history
(D) The variety of its uses in modernindustry

參考答案

答案：A
難度：簡單0.833333
統計：A(5),B(0),C(1),D(0),E(0)

內容推薦

內容推薦