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2017年职称英语理工类完形填空练习题(15)

  Wonder Webs

  Spider webs are more than homes, and they are ingenious traps. And the world’s best web spinner may be the Golden Orb Weaver spider. The female Orb Weaver spins a web of fibers thin enough to be invisible to insect prey, yet 1 enough to snare a flying bird without breaking.

  The secret of the web’s strength? A type of super-resilient 2 called dragline. When the female spider is ready to 3 the web’s spokes and frame, she uses her legs to draw the airy thread out through a hollow nozzle in her belly. Dragline is not sticky, so the spider can race back and forth along 4 to spin the web’s trademark spiral.

  Unlike some spiders that weave a new web every day, a Golden Orb Weaver 5 her handiwork until it falls apart, sometimes not for two years1. The silky thread is five times stronger than steel by weight and absorbs the force of an impact three times better than Kevlar, a high-strength human-made 6 used in bullet-proof vests. And thanks to its high tensile strength, or the ability to resist breaking under the pulling force called tension, a single strand can stretch up to 40 percent longer than its original 7 and snap back as well as new. No human-made fiber even comes 8 .

  It is no 9 manufacturers are clamoring for spider silk. In the consumer pipeline: high-performance fabrics for athletes and stockings that never run2. Think parachute cords and suspension bridge cables. A steady 10 of spider silk would be worth billions of dollars — but how to produce it? Harvesting silk on spider farms does not 11 because the territorial arthropods have a tendency to devour their neighhors.

  Now, scientists at the biotechnology company Nexia are spinning artificial silk modeled after Golden Orb dragline. The 12 step: extract silk-making genes from the spiders. Next, implant the genes into goat egg cells. The nanny goats that grow from the eggs secrete dragline silk proteins in their 13 . “The young goats pass on the silk-making gene without 14 help from us,” says Nexia president Jeffry Turner. Nexia is still perfecting the

  spinning process, but they hope artificial spider silk will soon be snagging customers 15 the real thing snags

  bugs.

  词汇:

  orb /C:b/ n. 圆状物 strand /strAnd/ n.绳,线之一股

  snare /snZE/ v.诱捕 clamor /5klAmE/ v.大嚷,强力要求

  snap /snAp/ n. (网)戳破,迅速弹回 pipeline /5paip7lain/ n. 管道,渠道

  resilient /ri5ziliEnt/ adj. 弹回的 stocking /5stCkiN/ n .长袜

  dragline /5drA^lain/ n. (蜘蛛的)避敌丝 parachute /5pArEFu:t/ n. 降落伞

  spoke /spEuk/ n. 辐条 territorial /7teri5tC:riEl/ adj. 领土的,领地的

  nozzle /5nCzl/ n.喷嘴 arthropod /5B:WrEpCd/ n. 节肢动物

  trademark /5treidmB:k/ n. 标记,特征 devour /di5vauE/ v.呑吃

  spiral /5spaiErEl/ n. 螺旋形 nanny goat雌山羊

  handiwork /5hAndiwE:k/ n.手工制品 secrete /si5kri:t/ v. 分泌

  bullet-proof /5bulitpru:f/ adj.防弹的 snag /snA^/ v.抓住

  tensile /5tensail/ adj. 可拉长的,张力的

  注释:

  1. sometimes not for two years:相当于 sometimes it does not fall apart for two years

  2. run:(编织物 )抽丝

  练习:

  1. A tough B soft C large D smooth

  2. A cloth B silk C nylon D wool

  3. A repair B pull C move D weave

  4. A him B her C it D those

  5. A refixes B reproduces C remakes D reuses

  6. A metal B mass C material D model

  7. A bredth B length C height D strength

  8. A close B well C open D awake

  9. A hurry B worry C wonder D use

  10. A shipment B supply C run D exchange

  11. A run B go C deal D work

  12. A previous B foremost C first D front

  13. A milk B meat C lungs D muscle

  14. A no B any C some D many

  15. A as fast as B as gently as C as fully as D as little as

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