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Camels are well known for their ability ...

    Camels are well known for their ability to survive the hot and dry conditions of the desertbut a study suggests they once grew well in colder climates. Scientists have found fossilized(化石) parts of a leg bone belonging to a giant camel that lived in the forests of Canada's High Arctic about 3.5million years ago.

The research is published in the journal Nature Communication. Dr. Mike Buckley, an author of the paper from the university of Manchester, said, "What's special about this story is that this is the northernmost evidence of camels. "The area was warmer than today 3.5 million years ago, but the ancient giant camels would have had to face long and bitter winter, with temperatures below freezing. There would have been snowstorms and about six months of darkness.

While scientists have known for some time that camels existed in North America, with the earliest creatures dating to about 45 million years ago, they were astonished to find a species at such a latitude(纬度).

Over the course of three investigations, which began in 2006researchers from the Canadian Museum of Nature collected 30 pieces of the leg bone from Ellesmere Island in Canada.

Their size suggested that the animal was about 30% larger than today's camels, measuring about 2.7m from foot to shoulder. Despite its size, the researchers believe it would have been similar in appearance, although it probably had a thicker coat to stay warm.

To investigate further, the team took the protein found in the bone from the fossils and modern animals. Dr. Buckley said, "The results tell us that it is a direct ancestor of modern camels. "

He said the findings provided a new insight into the evolution of this animal. "It suggests that many of the adaptations(适应) that we currently think of, in terms of camels being adapted to warm desert-like environments, could have actually originated through adaptation to quite the opposite cold, bitter environments. Camels 'humps(峰)which store fat could help get through an Arctic six-month winter. Their large eyes would have helped them to see in the low lightand their wideflat feet would have been just as useful for walking on snow as they are on sand"he explained.

1.What surprised the scientists when they found the giant camel fossils? ___

A.Their size. B.Their shape.

C.Their place. D.Their number.

2.According to the text, the ancient giant camels___.

A.could date to about 45million years ago

B.struggled to survive in severe conditions

C.were the first ancestors of modern camels

D.lived in an environment without light

3.Compared with modern camels, the ancient giant camels___.

A.were much taller

B.had more humps

C.were slightly stronger

D.had thinner coat

4.We can infer from what Dr. Buckley said that___.

A.giant camels had special adaptations for polar life

B.cold environments prevented giant camels developing

C.the cause of the extinction of giant camels remains unknown

D.the hard climates forced giant camels to adapt to warm environments

 

1.C 2.B 3.A 4.A 【解析】 本文是一篇说明文。文章介绍了一项新的发现,生活在干旱炎热地区的骆驼,曾经很好地适应寒冷的气候。 1.细节理解题。根据第二段What's special about this story is that this is the northernmost evidence of camels.(这个故事的特别之处在于,这是最北部的骆驼证据)以及第三段they were astonished to find a species at such a latitude(纬度).(他们惊奇地发现在这样的纬度上有一个物种)可推断,当科学家们发现了巨大的骆驼化石时,让科学家们大吃一惊的是他们的位置。故选C。 2.细节理解题。根据最后一段"It suggests that many of the adaptations(适应) that we currently think of, in terms of camels being adapted to warm desert-like environments, could have actually originated through adaptation to quite the opposite cold,(这表明,我们目前所认为的很多适应事实上很可能源于对极寒气候的适应)可知,古代的骆驼在当时正努力地适应极其寒冷的气候。由此可知选项B正确。故选B。 3.细节理解题。根据Their size suggested that the animal was about 30% larger than today's camels, measuring about 2.7m from foot to shoulder.(它们的大小表明这种动物比现在的骆驼要大30%,从脚掌到肩部有大约2.7米高。)一句可知这种古骆驼比现在的骆驼要大30%,有2.5米高。由此可知这种古骆驼比现在的骆驼要高得多。故选A。 4.推理判断题。根据最后一段Camels 'humps(峰)which store fat could help get through an Arctic six-month winter. Their large eyes would have helped them to see in the low light,and their wide,flat feet would have been just as useful for walking on snow as they are on sand(储存脂肪的驼峰有助于帮助骆驼渡过为期六个月的冬天。它们的眼睛帮助它们在光线暗的时候看到事物,它们的又宽又厚的脚掌有助于在雪上走路),可知这种古骆驼从驼峰,眼和脚掌等多个方面进化以适应极地的气候。故选A。
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1. 所续写短文的词数应为150左右3

2. 应使用5个以上短文中标有下划线的关键词语;

3. 续写部分分为两段,每段的开头语已为你写好;

4. 续写完成后,请用下划线标出你所使用的关键词语。

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Paragraph 2

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4.参加课外活动可以帮助我们找到更多有共同之处的人。(common

5.人们对野生动物的保护问题深感担忧。(cocerned

 

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