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
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