Wonder Webs
Spider webs are more than homes, and they are ingenious traps. And the worlds 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 webs strength? A type of super-resilient __2__ called dragline. When the female spider is ready to __3__ the webs 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 webs 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 years. 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 run. 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 neighbors.
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 Jeffrey 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.
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
答案 A B D C D C B A C B D C A B A
2015年英语六级翻译常用词汇(经济类)
英语专业八级考试样题 翻译(10)
英语专业八级考试样题 翻译(12)
2015年英语六级翻译常用词汇(古典文学类)
英语专业八级考试样题 翻译(8)
2015年英语六级翻译常用词汇(政治类)
英语翻译只是纸老虎
英语专业八级考试样题 翻译(1)
2011年英语专业八级翻译辅导1
2015年6月英语六级翻译备考练习:敬茶礼仪
英语专八翻译辅导——容易译错的句子
2015年6月英语六级翻译预测题(1)
英语专业八级考试样题 翻译(3)
专业四级英语阅读句式翻译素材——常用句
英语专业八级考试样题 翻译(6)
2015年6月英语六级翻译备考练习:丁克家族
2015年英语六级翻译常用词汇(教育类)
2015年6月英语六级翻译备考练习:歌谣和神话
2015年6月英语六级翻译备考练习:赡养父母
英语专八翻译辅导——容易译错的句子7
2007年专业英语四级完形及全文翻译试题及答案
2015年6月英语六级翻译预测题(2)
英语专业八级考试样题 翻译(9)
2015年6月英语六级翻译备考练习:景德镇瓷器
英语专业八级翻译练习(1)
六级翻译必备5大技巧
英语专业八级考试样题 翻译(11)
2015年英语六级翻译常用词汇(文化类)
英语专八翻译辅导——容易译错的句子5
2015英语六级翻译常用词汇(饮食类)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |