4.D
题干中的collagen fibers to the greatest extent是关键词,可以将答案定位在小标题Skin Is the Key下第二段的第一句话,The Duke University biologists have found that the greatest stretching occurs where the shark bends its body while swimming。这与本题句子的内容完全一致,
5.E
题干中a belted radial tire是关键词,可以将答案锁定在文章小标题Source of Energy下第一段的第三句话,Just as a radial tire is inflated by pressure, so, too, is the area just under the sharks collagen radials。其中的just as和so正说明了两者的相似之处在于inflated by pressure,所以答案应该是E。
6.G
题干中的关键词是a laminar flow,所以可以将答案锁定在文章小标题Dolphin Has Speed Record下,根据该节第一段的倒数第三、四句话,Normally when a fish or other object moves slowly through the water, the water flows smoothly past the body. This smooth flow is known as laminar flow.。题干是对这两句话的改写,所以正确答案是G。
7.I
题干中a slug和a mouse均为关键词,可以直接定位在小标题Other Animals Less Efficient下第一段的第二句话,It uses so much energy ... a mouse traveling the same distance uses only one twelfth as much energy。题干是对该句的同义改写.
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