2. 考研
  3. A. marine B. have discovered C. slows Phrases： A. This turbulence muses friction and【T1】______ the fish down B. Another ki

A. marine B. have discovered C. slows Phrases： A. This turbulence muses friction and【T1】______ the fish down B. Another ki

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问题 A. marine    B. have discovered    C. slows
Phrases：
A. This turbulence muses friction and【T1】______ the fish down
B. Another kind of【T2】______ animals is dolphin
C. Biologists studying the dolphin【T3】______ that
    【T4】______ This seagoing mammal has been clocked at speed of 32 kilometers (20miles) an hour. 【T5】______, like the shark, the animal’s efficient locomotion can be traced to its skin. A dolphin’s skin is made up in such a way that it offers very little resistance to the water flowing over it. 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. However, at faster speeds the water becomes more turbulent along the moving fish.【T6】______
【T6】
选项 A、 
B、 
C、 
答案A
解析 空白处的前一句提到the water becomes more turbulent along the moving fish，此处是说海豚把顺着鱼运动方向的水搅浑了，自然接下来得说“这种搅动的作用能引起摩擦，从而使周围的鱼游动的速度慢下来。”从而成了海豚的牺牲品。故选A。
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