根据短文，回答题。

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 are needed

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参考答案

答案解析

短文赏析．
困在砂砾中的地震幸存者将来可能会被日本秋田县立大学的Saga发明的一种新型的履带装置机器人拯救。它依靠磁场驱动穿越细小砂砾，装备了灯、照相机，以及传感器等设备。这种履带由一系列装满含有铁粒子、水和类似洗洁剂的表面活性剂的橡胶容器制造。它的移动原理是在履带装置的“主”容器内，磁力液体涌向磁场，致使容器向外突出，并且使其前后部分抬起。当磁场移动到下一个容器时，第一个容器摆脱束缚，向前弹出，同时下一个容器隆起。依靠这种动力，机器人不断蠕动前进。这种机器人能耗量高，但是其稳定性却是很好的。
答案及解析
56．B【解析】由第四段第一句“To make the caterpillar move forwards．Saga moves a magnetic field backwards along the caterpillar．”可以看出，磁场会向后移动，从而使机器虫移动。故应选B。

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A．A robotic caterpillar is made from a series of rubber capsules tilled with a magnetic flui

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2 The meaning of the word “peristalsis” in Paragraph 3 is similar to__________ 。

A．swimming

B．flying

C．crawling

D．walking

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A．A smooth surface is indispensable to biped robots and wheeled robot

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C．The robotic caterpillar only has robber capsules filled with a magnetic flui

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