A．To prevent the waste of energy.

　　B．To increase production safety.

　　C．To reduce pollution.

　　D．To save money.

　　75．Where does the text probably come from?

　　A．A research plan.

　　B．A science magazine.

　　C．A book review.

　　D．A business report.

　　2017·江苏] C

　　C

　　If a diver surfaces too quickly，he may suffer the bends.Nitrogen(氮)dissolved(溶解)in his blood is suddenly liberated by the reduction of pressure.The consequence，if the bubbles(气泡)accumulate in a joint，is sharp pain and a bent body—thus the name.If the bubbles form in his lungs or his brain，the consequence can be death.

　　Other air－breathing animals also suffer this decompression (减压) sickness if they surface too fast：whales, for example.And so, long ago, did ichthyosaurs.That these ancient sea animals got the bends can be seen from their bones.If bubbles of nitrogen form inside the bone they can cut off its blood supply.This kills the cells in the bone，and consequently weakens it，sometimes to the point of collapse.Fossil(化石) bones that have caved in on themselves are thus a sign that the animal once had the bends.

　　Bruce Rothschild of the University of Kansas knew all this when he began a study of ichthyosaur bones to find out how widespread the problem was in the past.What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of decompression over the 150 million years.To this end, he and his colleagues traveled the world's natural－history museums, looking at hundreds of ichthyosaurs from the Triassic period and from the later Jurassic and Cretaceous periods.

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