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(北师大版)2022高三一轮复习课时作业:选修8 Unit 22 Environmental Protection 单元主题语篇训练 (一) Word版(英语 解析版)
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  • 资源类别试题
    资源子类一轮复习
  • 教材版本北师大版(现行教材)
    所属学科高中英语
  • 适用年级高三年级
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  • 更新时间2022/1/3 14:03:52
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A

Meet the longest­living vertebrate(脊椎动物)in the world, the Greenland shark.

Found primarily in the very cold waters of the North Atlantic, these slow­swimming sharks can be as big as the largest great whites, reaching up to 21 feet in length.They're among the largest of carnivorous (食肉的) fish, and yet grow perhaps only a centimeter or so a year.Such slow growth yet big size is usually an indicator of a long­lived animal.

We only expected that the sharks might be very old Julius Nielsen, at the University of Copenhagen in Denmark, told NPR.“But we did not know in advance.And it was, of course, a very big surprise to learn that it was actually the oldest vertebrate animal.”

Imagine being 150 years old before you're ready to have your first child! Imagine being born before the United States was even a reality.For humans — who rarely make it to a century mark — it's difficult to fully understand.

Little is known about Greenland sharks, even basics such as where they give birth or how many of them there are, though researchers at a conference at the University of Exeter thought that they may mate in “hidden”Arctic fjords.No one has even witnessed one hunting, though they have been found to have various vertebrate ones in their stomachs such as polar bear, seals, fast­swimming fish and even moose etc.

Given the shark's incredibly long lifespans, scientists are diving into the sea creature's genome, looking for clues.That conference also highlighted the work being done to separate the shark's longevity gene, with complete DNA information gathered from almost 100 sharks, including some born in the 1750s.Finding such a gene could go a long way in explaining why some vertebrates, like humans, have such limited lifespans.

These sharks also serve as swimming history books.Their tissue, bones and DNA could tell us a great deal about the waters of the world from a time before the Industrial Revolution, large­scale commercial fishing and the pronounced ocean pollution we see today.

Check out what it's like to swim with one in this encounter with what is a small and young — and yet to us, still fairly old — Greenland shark.

语篇解读:本文是一篇说明文。科学家们发现格陵兰鲨鱼是世界上最长寿的脊椎动物。

1What can we know about Greenland sharks from the first two paragraphs?

ALongest­living, and slow­swimming carnivorous vertebrate.

BLongest­living, and slowest­swimming vertebrate.

CLargest, but fast­growing carnivorous vertebrate.

DLongest­living, largest carnivorous vertebrate but fast­growing.

解析:A 细节理解题。根据第一段可知,格陵兰鲨鱼是世界上最长寿的脊椎动物。根据第二段第一、二句可知,这种鲨鱼游泳缓慢并且食肉。

2Why were scientists surprised after they examined Greenland shark?

AGreenland shark can live as old as humans.

BGreenland shark is the largest animal in the world.

CGreenland shark can live more than one hundred years.

DGreenland shark is really the oldest vertebrate in the world.

解析:D 细节理解题。根据第三段中的a very big surprise to learn that it was actually the oldest vertebrate animal可知,科学家们因为发现格陵兰鲨鱼是世界上最古老的脊椎动物而感到惊讶。

3What kind of animals do Greenland sharks prefer?

ABoth polar bear and seal.

BOnly fast­swimming fish.

CVarious vertebrate animals.

DPolar bear, moose and fish.

解析:C 细节理解题。根据第五段最后一句可知,格陵兰鲨鱼喜欢吃各种各样的脊椎动物。

4What information can we get from the passage?

AScientists declare that they have known all about Greenland sharks.

BScientists want to get more information about longevity from their study on sharks.

CScientists consider sharks can only serve as swimming history books.

DScientists just want to know why Greenland sharks have a long life.

解析:B 推理判断题。根据第六段可推知,科学家们希望从他们对鲨鱼的研究中获得更多关于长寿的信息。

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