Scientists think they have answered a mystery: How some ocean creatures got so huge so quickly.A few million years ago, the largest whales, averaged about 15 feet long. Then seemingly overnight, one t 题目和参考答案——青夏教育精英家教网—

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Scientists think they have answered a mystery: How some ocean creatures got so huge so quickly.

A few million years ago, the largest whales, averaged about 15 feet long. Then seemingly overnight, one type of whale, the toothless baleen whale（须鲸类）became huge. Modern blue whales get as big as 100 feet. Nicholas Pyenson of the Smithsonian Natural History Museum said, “Why is that?” ”It happened in the glance of an evolutionary eye, which makes it harder to figure out what happened,” said Graham Slater, lead author of the study. Their study has suggested an answer: Ice ages in the last 3 to 5 million years started it, changing the oceans and food supply for whales.

The researchers used fossil records of the smaller whales to create a family tree for baleen whales which include blue whales, humpbacks and right whales. Using computer simulations（模拟）and knowledge about how evolution works, they concluded that when the size changes started, the poles got colder, ice expanded and the water circulation in the oceans changed and winds shifted, Slater and Pyenson said cold water went deep and moved closer to the equator(赤道）and then eventually moved back up with small fish and other small animals that whales eat.

Baleen whale, which have no teeth, feed by eating huge amounts of fish they capture. Toothed whales, like sperm whales (抹香鲸), hunt individual fish, so the ocean chants that made food less evenly spread out didn’t affect them as much. But baleen whales hunt schools of fish.

Olivier Lambert at the Royal Belgian Institute of Natural Sciences calls it “a really convincing situation”. But he said the lack of fossils in certain time periods is an issue. As oceans warm from man-made climate change, the seas will be more like it was when the whales smaller and they will have a more difficult time surviving.

1.What does the author mean by “It happened in the glance of an evolutionary eye” in the second paragraph?

A. The change of baleen whales happened too quickly.

B. The change of baleen whales was too difficult to explore.

C. Researchers paid little attention to the change of baleen whales.

D. Researchers thought the change of baleen whales was unimportant.

2.What played the key role in baleen whales’ becoming huge?

A. Man-made climate change.

B. Its eating a huge amount of fish.

C. The water circulation in the oceans.

D. The increase of food supply for whales.

3.What do we know about sperm whales and blue whales according to the text?

A. Sperm whales eat more food.

B. Blue whaler live much longer.

C. Sperm whales prefer to hunt schools of fish.

D. Blue whales usually swallow schools of fish.

4.What can we infer from the last paragraph?

A. There are no whale fossils now.

B. The whales may become even bigger.

C. Global warming has threatened the whales.

D. Olivier Lamber thinks the study is perfect.

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So they quit their jobs, took their sons, then aged six and nine, out of school and went to southern Spain where they bought a 15-metre yacht(游艇) and headed up the coast to Barcelona. Soracha was not even three. And they brought along Poppy, the family dog. Now, two and a half years and 10,000 km later, they don't intend to stop. Tedd is a yacht engineer and can find work in ports. But, says Phillida, a supply teacher (代课老师), "Any family could do this."

The children are home-schooled using a correspondence course (函授课程). "My son had a recent project on the weather. The weather is crucial to us. My son knows more than most adults about weather systems, compasses, maps and directions. The weather, for him, means life or death."

Other subjects have become equally vivid. "They're living geography and history all the time. We've sailed round Italy, Sardinia, Sicily, and seen tiny islands we didn't know. The kids learned about ancient Romans by visiting Rome."

But what about social development? Again, Phillida is sanguine. "The children have become much more socially confident since we set out. They play with tons of families of all nationalities on other boats we meet."

Living for the moment, they believe, is a huge life lesson. "Our children never say they're bored." The other day they stopped mid-ocean and the kids swam, 110 km from land. "That's the kind of freedom we want for them," says Phillida. "That's the kind of freedom they've got."

1.The couple quit their jobs and took their children traveling because .

A. their children wanted to make friends of all nationalities

B. they wanted to experience more in their lives

C. their children wanted complete freedom

D. they were unhappy with their lives

2.The underlined word "sanguine" in Paragraph 5 is closest in meaning to " ".

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C. excited D. optimistic

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Never shall I forget that poem and the inspiration _________provided for my first novel.

A. which B. that

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W：So Mr Brown，this is your bed，and as you can see，there are three other beds in the ward.Have you 1.(get) everything you need?

M：Yes，madam，I think 2.．I followed the hospital's advice，and I've only brought a few 3.(belong) with me.

W：Good，you can see the reasons 4. we ask you to do that，the cupboard is 5.(real)very small.

M：Yes.madam，can you tell me what the visiting hours are?

W：Yes，of course.They are in the afternoon from 2：30 to 4：30 and in the evening from 7：00 6.8：00，but remember that only two people can see you at the same time.

M：I see.What other rules are there?

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W：Yes.Well，you can see the no 8.(smoke) sign.We don't allow smoking in the wards，and the same 9.(go) for alcohol.However，if you 10.(need) to smoke，there are special rooms.

M：Oh，I don't smoke，so it doesn't affect me.

W：Good.

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1.简要介绍中国京剧；

2.演出内容：京剧名段；

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2.可以适当增加细节，以使行文连贯。

____________________________________________________________________________________________

_____________________________________________________________________

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They _______________ and get on well with each other.

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Several years _______________ before they met again.

3.这儿夏天不常下雨，因此，我们不得不给菜园浇水。

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A medical team _______________ 3 doctors was sent to the disaster area.

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电影内容	以曼德拉的自传(autobiography)为基础

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1993年:获得诺贝尔和平奖
1994年:当选为南非总统
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