To many web-building spiders, most of 【C1】______are nearly blind, the web is their essenti
To many web-building spiders, most of 【C1】______ are nearly blind, the web is their essential window 【C2】______ the world: their means of communicating, 【C3】______ prey, meeting mates and protecting themselves. A web-building spider 【C4】______ its web is like a man marooned on an island of solid rock, totally out of touch and destined to starve to death. So 【C5】______ is the web to an orb-web spider's survival that the animal will continue to construct new webs daily 【C6】______ it is being starved.
For 16 days the 【C7】______ spider builds completely normal webs. Then, as the animal gets scrawnier, it constructs a wider-meshed web using 【C8】______ strands. Such webs would only trap larger prey, which is more 【C9】______ from the perspective of a starving spider.
The spider 【C10】______ energy by recycling web protein. It simply eats its own web each evening and reuses it to manufacture 【C11】______ silk. In studies with radioactively labeled materials, it 【C12】______ that 95 percent of web protein reappeared in 【C13】______ web. Most of the energy needed for web-building is used in walking over the strands as they are laid down.
Scientists are 【C14】______ by the adaptability of the spider's highly preprogrammed brain, which is larger 【C15】______ its size than the brain of any other invertebrate. If web-building is interrupted, or if some of the 【C16】______ strands are destroyed, the spider 【C17】______ retraces its steps to see where the web is 【C18】______ and then finishes building a 【C19】______ web. One spider will even finish building the incomplete web of 【C20】______ .
【C1】
A．them
B．whom
C．that
D．which
时间：2023-03-17 15:56:46
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1. A. he B. which C. who D. she
2. A. to B. on C. upon D. in
3. A. look B. appear C. turn D. come
4. A. watched B. followed C. searched D. hurt
5. A. bus B. car C. train D. plane
6. A. safe B. more worried C. dangerous D. safer
7. A. reading B. looking C. seeing D. watching
8. A. when B. after C. as D. until
9. A. frightened B. happy C. excited D. surprised
10. A. someone B. no one C. anyone D. none
11. A. on B. for C. at D. over
12. A. before B. when C. as D. until
13. A. thief B. footsteps C. spy D. murderer
14. A. sound B. noise C. voice D. word
15. A. whether B. as if C. even if D. if
