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 (捕食动物)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(猎物)as well as predator—and often had to make a speedy exit as a result.
61.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.
62.The purpose of Rothschild'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
63.Rothschild's finding stated in Paragraph 4
【五年高考(2011-2015)英语试题分项精解:专题23 阅读理解之科普知识类(解析版)】相关文章:
★ 2017高考四川省广安市英语阅读理解一轮系列训练:26(含解析)
★ 2017年高考英语二轮复习精品资料:专题15 完形填空(押题专练)(原卷版)
★ 2017届高考英语二轮复习大题冲关秘籍语法填空:解题技巧(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:23(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:28(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:30(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:25(含解析)
★ 2017年高考英语二轮复习精品资料:专题14 阅读理解(教学案)(原卷版)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:29(含解析)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21