Question

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.

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 the died, but not a single Trassic specimen showed evidence of that sort of injury.

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.

Whales that suffer the bends often do so because they have sufaced to escape a predator (捕食動物) such as a large shark. One of the features of the Jurassia oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaurs lunches. Trassic oceans, by contrast, were mercifully shark-and crocodile-free. In the Trassic, then, ichthyosaurs were top of the food chain. In the Jurrasic 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 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

3.Rothchild’s finding stated in Paragrapg 4            .

A. confirmed his assumption          B. speeded up his research process

C. disagreed with his assumption      D. changed his research objectives

4.Rothchild might have concluded that ichthyosaurs          .

A. failed to evole an anti-decompression means

B. grdually developed measures against the bends

C. died out because of large sharks and crocodiles

D. evoled an anti-decompression means but soon lost it

 

Answer 1

【答案】

 

1.A

2.B

3.C

4.A

【解析】

試題分析：本篇為科普說明文，講述魚龍患減壓病的原因和后果。Dr Rothschild通過實驗推翻了關(guān)于魚龍進化的一些猜測。

1.細節(jié)理解題。根據(jù)the bends可定位到首段。由“The consequence…is sharp pain and a bent body—thus the name.”可知答案，a bent body和a twisted body是同義轉(zhuǎn)換。由第二句的“Nitrogen dissolved in his blood is suddenly liberated by the reduction of pressure.”可知，這是說the bends的形成原因，故C、D項錯，而B項文章沒有提及。選A。

2.推理判斷題。題干中的關(guān)鍵詞是Rothschild's study，由此可定位到第三段的前兩句。根據(jù)“…to find out how widespread the problem was in the past…to investigate was how ichthyosaurs adapted to the problem of decompression…”可知答案為B。

3.推理判斷題。根據(jù)第四段“…h(huán)e 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.”可知，Rothschild的假設(shè)結(jié)論與在研究過程中得出的結(jié)果是相反的，故選C項。

4.推理判斷題。根據(jù)倒數(shù)第二段可知，Rothschild認為魚龍在進化過程中反減壓方式進化失敗，故選A項。

考點：考查科普類短文