56．From this passage，we can learn that＿＿＿．
　　[A]a robotic caterpillar can crawl by a pair of rubber rods
　　[B]when a caterpillar moves，the magnetic field moves backwards along it
　　[C]the environment couldn’t influence a robotic caterpillar’s guts，which are wrapped in a capsule
　　[D]crawling is very stable and efficient，and when it moves，only a few elements ale needed
　　57．According to this passage，which is not true about the construction of the robotic caterpillar?
　　[A]A robotic caterpillar is made from a series of rubber capsules filled with a magnetic fluid．
　　[B]Iron particles，water，and a detergent-like surfactant form a magnetic fluid．
　　[C]Each capsule filled with a magnetic fluid is linked to a pair of robber rods．
　　[D]In order to keep stable condition，the caterpillar’s guts are wrapped in a clear，flexible polymer tube．
　　58．The meaning of the word“peristalsis”in Paragraph 3 is similar to＿＿＿．
　　[A]swimming 
　　[B]flying
　　[C]crawling 
　　[D]walking
　　59．Comparing the robotic caterpillar and the other robots，which of the following is not true?
　　[A]A smooth surface is indispensable to biped robots and wheeled robots．
　　[B]Flying robots ale very inconvenient when moving，because they have too many moving parts．
　　[C]The robotic caterpillar only has robber capsules filled with a magnetic fluid．
　　[D]It’s incapable for wheeled robots to locate trapped people because they ale impossible to miniaturize．
　　60．The passage is mainly about＿＿＿．
　　[A]why a robotic caterpillar can find trapped people
　　[B]how a robotic caterpillar works
　　[C]the instruction of the magnetic caterpillar
　　[D]how a robotic caterpillar crawls

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