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根据下列材料请回答 51～65 题：The Greatest Mystery of WhalesThe whale is a mammal（哺乳动物)

根据下列材料请回答 51～65 题：

The Greatest Mystery of Whales

The whale is a mammal(哺乳动物)一warm—blooded，air-breathing，giving birth to its young alive，sucking them—and，like all mammals，originated on land，There are many signs of this．________(51)front flippers(鳍肢)，used for steering and stability，are traces of feet。

Immense strength is built into the great body of the big whales，and in fact most of a whale’s body is one gigantic muscle。The blue whale’s pulling________ (52)has been estimated at 400 horsepower．One specimen was reported to have________ (53) a whaling vessel for seven hours at the________ (54)of eight knots．

An enraged whale will attack a ship．A famous________ (55)of this was the fate of whaler Essex，which was sunk________(56)the coast of South America early in the last century．More recently ,steel ships have had their plates buckled(扭曲变形)in the same way．Sperm whales were known to________ (57)the old—time whaleboats in their jaw sand crush them．

The greatest mystery of whales is their diving ability．The sperm whale can________ (58)the bottom for his favorite food，the octopus(章鱼)．________ (59)that search he is known to go as far down as 3，200 feet，where the pressure is 1，400 pounds，to the square inch．Doing________ (60)he will remain submerged(水下的)as long as one hour．Two feats(绝技)are involved in this：storing up enough________ (61)(all whales are air-breathed)and withstanding the great change in pressure．Just________(62)he does it scientists have not determined．It is believed that some of the oxygen is stored in a special system of blood vessels，rather than just held in the lungs。And________ (63)is believed that a special kind of oil in his head is some sort of compensating mechanism that automatically adjusts the internal pressure of his body．But________ (64)you can’t bring a live whale into the laboratory for study，no one________(65)just how these things work.

第 51 题

A．Their

B．It's

C．Theirs

D．Its

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更多“根据下列材料请回答 51～65 题：The Greatest…”相关的问题

第1题

根据下列材料请回答 51～65 题：第 51 题

根据下列材料请回答 51～65 题：

根据下列材料请回答 51～65 题：第 51 题根据下列材料请回答 51～65 题：第 51 题

第 51 题

根据下列材料请回答 51～65 题：第 51 题根据下列材料请回答 51～65 题：第 51 题

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第2题

根据材料请回答 51～65 题: 第 51 题

根据材料请回答 51～65 题:

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根据材料请回答 51～65 题: 第 51 题根据材料请回答 51～65 题: 第 51 题请帮

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第3题

根据材料请回答 51～65 题 The History of American Marriage The horse and carriage is a th

根据材料请回答 51～65 题

The History of American Marriage The horse and carriage is a thing of the past, but love and marriage are still with us and still closely interrelated. Most American marriages, particularly first marriages 51 young couples, are the result of 52 attraction and affection rather than practical consid-erations. In the United States, parents do not arrange marriages for their children.Teenagers begin 53 in high school and usually find mates through their own academic and social 54 .Though young people feel free to choose their friends from 55 groups, most choose a ma-te of similar background.This is 56 in part to parental guidance.Parents cannot select spouses for their children, but they can usually influence choices by 57 disapproval of someone they consider unsuitable. 58 , marriages between members of different groups (interclass, interfaith, and in-terracial marriages) are increasing, probably because of the greater 59 of today's youth and the fact that they are restricted by fewer prejudices than their parents.Many young people leave their home towns to attend college, 60 in the armed forces, or pursue a ca- reer in a bigger city.Once away from home and family, they are more 61 to date and marry outside their own social group. In mobile American society, interclass marriages are neither 62 nor shocking.Inter-faith marriages are 63 the rise particularly between Protestants and Catholics.On the other hand, interracial marriage is still very uncommon.It can be difficult for interracial couples to find a place to live, maintain friendships, and 64 a family.Marriages between people of different national 65 (but the same race and religion) have been commonplace here since colonial times.

第 51 题

A．involving

B．linking

C．connecting

D．correlating

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第4题

根据下面材料，回答 51～65 题。第 51 题

根据下面材料，回答 51～65 题。

根据下面材料，回答 51～65 题。第 51 题根据下面材料，回答 51～65 题。第 51

第 51 题

根据下面材料，回答 51～65 题。第 51 题根据下面材料，回答 51～65 题。第 51

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第5题

根据材料请回答 51～65 We know the kiss as a form. of expressing affection.But long befo

根据材料请回答 51～65

We know the kiss as a form. of expressing affection.But long before it became 51 ,it was the custom in many parts of the world to use the kiss as a(n) 52 of respect.

In many African tribes the natives kiss the ground over which a chief has walked.Kissing the hand and foot has been a mark of respect form. the 53 times.

The early Romans kissed the mouth or eyes as a form. of dignified greeting.One Ro-man emperor allowed his important nobles to kiss his lips, but the 54 important ones had to kiss his hands, and the 55 important ones were only allowed to kiss his feet!

It is quite probable that the kiss as a form. of affection can be traced back to primitive times when a mother 56 fondle her child, just as a mother 57 today. It only remained for society to 58 this as a custom for expressing affection between adults.

We have evidence that this was already the 59 by the time of the sixth century, but we can only assume it was 60 long before that.The first 61 where the kiss became ac-cepted in courtship and love was in France.When dancing became popular, almost every dance figure ended 62 a kiss.

From France the kiss spread rapidly all over Europe.Russia, which loved to 63 the customs of France，adopted the kiss and it spread there through all the upper classes．A kiss from the Tsar became one of the highest forms of recognition from the Crown．

In time，the kiss became a part of courtship． 64 marriage customs developed，the kiss became a part of the wedding ceremony．Today，of course，we regard the kiss as ai expression of love and tenderness．But there are still many places in the world where th。kiss is 65 0f formal ceremonies and is intended to convey respect．

第 51 题

A．it

B．one

C．this

D．itself

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第6题

根据下列文字，回答 51～65 题。第 51 题回答第1空。

根据下列文字，回答 51～65 题。

根据下列文字，回答 51～65 题。第 51 题回答第1空。根据下列文字，回答 51～65 题。

第 51 题回答第1空。

根据下列文字，回答 51～65 题。第 51 题回答第1空。根据下列文字，回答 51～65 题。

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第7题

根据下列文章,请回答 51～65 题。第 51 题请选择（1）处最佳答案。

根据下列文章,请回答 51～65 题。

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第8题

根据下列短文，回答 51～65 题。第 51 题回答第1空（）

根据下列短文，回答 51～65 题。

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第9题

根据下列材料请回答 16～22 题：第 16 题 Genera Technologies has developed a method th

根据下列材料请回答 16～22 题：

根据下列材料请回答 16～22 题：第 16 题 Genera Technologies has

第 16 题 Genera Technologies has developed a method that determines whether water is clean.

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第10题

根据下列阅读材料，回答 51～55 题：第 51 题 The author says that old family firms ____

根据下列阅读材料，回答 51～55 题：

根据下列阅读材料，回答 51～55 题：第 51 题 The author says that o

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第 51 题 The author says that old family firms __________.

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