The death of Osama bin Laden, the mastermind of 9/11 terroristattacks, may act as a _______ for retaliationfrom al-Qaida. TerrorismexpertswarnedthatOsama’s followerswerelikely to takerevengeover his death and launchretaliatoryattacks on the U.S.
(A) catalyst (B) casualty (C) circumference (D) commemoration
Glassfibershave a longhistory. The Egyptiansmadecoarsefibers by 1600 B.C., and
fiberssurvive as decorations on Egyptianpotterydatingback to 1375 B c. During the
Renaissance (fifteenth and sixteenthcenturies A.D.), glassmakersfromVeniceusedglassLinefibers to decorate the surfaces of plainglassvessels. However, glassmakersguardedtheir
(5) secrets so carefullythat no one wroteaboutglassfiberproductionuntil the earlyseventeenthcentury.
The eighteenthcenturybrought the invention of "spunglass" fibers. Rene-Antoine de
Reaumur, a Frenchscientist, tried to makeartificialfeathersfromglass. He madefibers
by rotating a wheelthrough a pool of moltenglass, pullingthreads of glasswhere the hot
(10) thickliquidstuck to the wheel. His fiberswereshort and fragile, but he predictedthatspunglassfibers as thin as spidersilkwould be flexible and could be wovenintofabric.
By the start of the nineteenthcentury, glassmakerslearned how to makelonger, strongerfibers by pullingthemfrommoltenglasswith a hot glasstube. Inventorswound the
cooling end of the threadaround a yarnreel, thenturned the reelrapidly to pullmorefiber
(15) from the moltenglass. Wanderingtradespeoplebegan to spinglassfibers at fairs, makingdecorations and ornaments as novelties for collectors, but thismaterial was of littlepractical use; the fiberswerebrittle, ragged, and no longerthan ten feet, the circumference
of the largestreels. By the mid-1870's, however, the bestglassfiberswerefinerthansilk
and could be wovenintofabrics or assembledintoimitationostrichfeathers to decorate
(20) hats. Cloth of whitespunglassresembledsilver; fibersdrawnfromyellow-orangeglasslookedgolden.
Glassfiberswerelittlemorethan a noveltyuntil the 1930's, whentheirthermal and
electricalinsulatingpropertieswereappreciated and methods for producingcontinuousfilamentsweredeveloped. In the modernmanufacturingprocess, liquidglass is fed
(25) directlyfrom a glass-meltingfurnaceinto a bushing, a receptaclepiercedwithhundreds
of finenozzles, fromwhich the liquidissues in finestreams. As theysolidify, the streams
of glass are gatheredinto a singlestrand and woundonto a reel.
【題組】7. The production of glassfibers was
improved in the nineteenthcentury by
which of the following (A) Addingsilver to the moltenglass (B) Increasing the circumference of the
glasstubes (C) Puttingsilkthread in the center of the
fibers (D) Using yam reels