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 (氣泡) 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 (減壓) 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.
When he started, he assumed that signs of the bends would be rarer in younger fossils, reflecting their gradual evolution of measures to deal with decompression. Instead, he was astonished to discover the opposite. More than 15% of Jurassic and Cretaceous ichthyosaurs had suffered the bends before they died, but not a single Triassic specimen (標(biāo)本) showed evidence of that sort of injury.
If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.
Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食動(dòng)物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey (獵物) as well as predator—and often had to make a speedy exit as a result.
【小題1】Which of the following is a typical symptom of the bends?
A.A twisted body. |
B.A gradual decrease in blood supply. |
C.A sudden release of nitrogen in blood. |
D.A drop in blood pressure. |
A.how often ichthyosaurs caught the bends |
B.how ichthyosaurs adapted to decompression |
C.why ichthyosaurs bent their bodies |
D.when ichthyosaurs broke their bones |
A.confirmed his assumption | B.speeded up his research process |
C.disagreed with his assumption | D.changed his research objectives |
A.failed to evolve an anti-decompression means |
B.gradually developed measures against the bends |
C.died out because of large sharks and crocodiles |
D.evolved an anti-decompression means but soon lost it |
【小題1】A
【小題2】B
【小題3】C
【小題4】A
解析【文章大意】本文是說(shuō)明文,也可以說(shuō)是研究發(fā)現(xiàn),是對(duì)魚(yú)龍等海洋生物變彎曲的原因的研究。
【小題1】從文章第一段第三句可知是身體的疼痛和彎曲。
【小題2】從文章第三段第二句可知研究是想發(fā)現(xiàn)在1億5千萬(wàn)年前魚(yú)龍是怎樣適應(yīng)減壓?jiǎn)栴}的。
【小題3】從第四段第一句的“assume”和第二句中的“Instead,he was astonished to discovered the opposite.”可知答案。
【小題4】從第五段可知Rothschild認(rèn)為魚(yú)龍并沒(méi)有形成抗減壓的方式,他認(rèn)為是其他動(dòng)物的進(jìn)化引起的變化。
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SCUBA diving is not without its dangers, however. The mixture of nitrogen and oxygen divers breathe underwater, combined with the pressure under the water can be deadly if a diver rises too quickly to the surface, causing a condition called ‘the bends’. Divers can also get lost or trapped when diving on wrecks, and fatalities(死亡)are particularly common in cave diving, where divers add to the dangers of diving by swimming through underground caves filled with water. Diving can also be harmful to the underwater environment. However with proper precautions diving can open up a whole new world, far from the stresses of daily life.
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D. Give information about SCUBA diving.
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A. There is uncertainty about SCUBA diving safety.
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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 (氣泡) accumulate in a joint, is sharp pain and a bent body — thus the name. If the bubbles form in his lungs or brain, the consequence can be death.
Other air-breathing animals also suffer this decompression (減壓) sickness if they surface too fast: whales, for example. And so, long ago, did ichthyosaurs (魚(yú)龍). 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 suty of ichthyosaurs 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 decompession over the 150 milllion years. To this end, he and his colleagues traveled the world’s natural-history museums, looking at hundreds of ichthyosaurs from the Trassic period and from the later Jurassic and Cretaceous periods.
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If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly — and, most strangly, they lost it afterwards. But that is not what Dr Rothchild thinks happened. He suspects it was evolution in other animals that caused the change.
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1.Which of the following is a typical symptom of the bends?
A. A twisted body.
B. A gradual decrease in blood supply.
C. A sudden release of nitrogen in blood.
D. A drop in blood presure.
2.The purpose of Rothchild’s study is to see .
A. how often ichthyosaurs caught the bends
B. how ichthyosaurs adapted to decompression
C. why ichthyosaurs bent their bodies
D. when ichthyosaurs broke their bones
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A. confirmed his assumption B. speeded up his research process
C. disagreed with his assumption D. changed his research objectives
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A. failed to evole an anti-decompression means
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Other air-breathing animals also suffer this decompression (減壓) 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.
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If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.
Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食動(dòng)物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey (獵物) as well as predator—and often had to make a speedy exit as a result.
1.Which of the following is a typical symptom of the bends?
A.A twisted body.
B.A gradual decrease in blood supply.
C.A sudden release of nitrogen in blood.
D.A drop in blood pressure.
2.The purpose of Rothschild’s study is to see ______.
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C.why ichthyosaurs bent their bodies
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C.disagreed with his assumption D.changed his research objectives
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63. What is the writer trying to do in the text?
A. Advertise some popular diving sites.
B. Describe how to dive underwater.
C. Warn people against diving in the sea.
D. Give information about SCUBA diving.
64. What can the reader learn from the text?
A. There is uncertainty about SCUBA diving safety.
B. Divers have caused a lot of damage to the environment.
C. SCUBA diving is an old sport with a long history.
D. Divers always face the pressures in their life.
65. How might the writer describe SCUBA diving?
A. Interesting. B. Relaxing. C. Frightening D. Unpleasant.
66. What do you think the author is most likely to suggest if he continues to write?
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