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】______
【T5】
选项 A、 
B、 
C、 
答案C
解析 根据该空的后半句like the shark，the animal’s efficient locomotion can be traced to its skin可以推出其前半句的内容，因为can be traced意为“能被追溯到”的，行为主体必须是人。正是研究海豚的生物学家才能发现这一点。故选C。
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