To many web-building spiders, most of whom are nearly blind, the web is their essential wi

To many web-building spiders, most of whom are nearly blind, the web is their essential window on the world: their means of communicating, capturing prey, meeting mates and protecting themselves. A web-building spider without its web is like a men cast away on an island of solid rock，totally out of touch and destined to starve to death. So important is the web to an orb-web spider's survival that the animal will continue to construct new webs daily even if it is being starved. For 16 days the starving spider builds completely normal webs. Then, as the animal gets scrawnier, it constructs a wider-meshed （网孔、网眼）web using fewer strands（线）. Such webs would only trap larger prey, which is more economical from the perspective of a starving spider. The spider stores energy by recycling web protein. It simply eats its own web each evening and reuses it to produce new silk. In studies with radioactivity, labeled materials, it was found that 95 percent of web protein reappears in the next day web. Most of the energy needed for web-building is used in walking over the strands as they are laid down. Scientists are impressed by the adaptability of the spider's highly preprogrammed brain, which is larger for its size than the brain of any other invertebrate（无脊推动物）. If web-building is interrupted, or if some of the existing strands are destroyed, the spider simply goes back to see where the web is left off and then finishes building a normal web. One spider will finish building the incomplete web of another.
【小题1】Which of the following best expresses the main ideas of the passage?A．Secrets of Spiders' AdaptabilityB．Importance of Webs to SpidersC．Secrets of the Spiders' LifeD．Spiders' Highly Preprogrammed Brain【小题2】According to the passage, which of the following statements is TRUE?A．Most spiders will stop conducting webs when hungry. B．One Web-building spider usually conducts one web.C．Web-building spiders will probably die without their webs.D．Web-building spiders have good eyesight.【小题3】The underlined word “scrawnier” in the second paragraph probably means . A．weaker but good-lookingB．fatter and strongerC．nice and healthierD．thinner and bony【小题4】A spider's ability to finish an incomplete web proves that .A．it has a highly preprogrammed brain B．it reuses its web protein to reproduce new silkC．the web is everything for a spider D．it is able to rebuild a destroyed webB

(答案→)B 解析：文章大意：讲述蜘蛛和网之间的关系。【小题1】B主旨大意题：根据句首第一句：To many web-building spiders, most of whom are nearly blind, the web is their essential window on the world: theirmeans of communicating, capturing prey, meeting mates and protecting themselves. A web-building spider without its web is like a men cast away on an island of solid rock，totally out of touch and destined to starve to death. 对许多织网的蜘蛛来说，他们大部分几乎是瞎子，网是他们在世界上必须的东西：他们交流，捕捉猎物，会见同伴，自我保护的的方式。【小题2】C 细节理解：根据A web-building spider without its web is like a men cast away on an island of solid rock，totally out of touch and destined to starve to death. 一个没有网的蜘蛛就像一个被扔在荒石岛上的人，完全与人失去联系，注定要饿死。所以选C。没有网的话，蜘蛛很可能会死掉。【小题3】D 词义猜测：根据前文For 16 days the starving spider builds completely normal webs. 饥饿的蜘蛛16天的时间会织造完整的正常的蛛网。和后句Such webs would only trap larger prey, which is more economical from the perspective of a starving spider. 这样的网只用来捕捉提醒大些的猎物，这样做，从一只饥饿的蜘蛛的角度来说更加合算。所以推测出更瘦的，骨瘦如柴的。【小题4】A 细节理解根据Scientists are impressed by the adaptability of the spider's highly preprogrammed brain,蜘蛛的高度预编好的大脑的适应性给科学家们留下了深刻印象。下面用蜘蛛能修补好蜘蛛网为例证明这个论点。反之，蜘蛛能修补好蜘蛛网证明了蜘蛛有高度预编的大脑的论点。

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