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Since the beginning of history, man has been attracted by the idea of living forever, of wining the fight against death and disease. So far, this has only remained a dream, though a very powerful one. Many people have wondered whether it would be possible to find a way to preserve(保存) human bodies, and what would be the best way to preserve human bodies.

It has long been known that meat or fruit can be kept fresh for long periods by freezing; in ancient China, for example, food was stored with ice to keep it fresh. This method could also be useful for preserving humans, and in fact many people have explored this possibility.

However, most living beings that exist under warm conditions die when frozen. This is because of the harmful effects of freezing ice crystals(晶体), which form sharp cutting shapes that harm the cells.

In the 1940s, Dr B.J. Luyet and a group of scientists in England were working on the problem of freezing cells without damaging them. Since the harm caused by ice crystals was the main cause of the damage, Luyet suggested removing some or all of the water from the cells before freezing them.

Using living cells from chicken, Luyet and his assistants discovered that they could partly dry the chicken cells, using a mixture of the white part of an egg and glycerin(甘油). Some success was achieved.The chicken cells were dried, frozen for a period of time, and then carefully unfrozen. Almost all the cells recovered when they reached normal temperatures.

Since then, the cooling of whole animals to a temperature very much below freezing point for later unfreezing has become more of a possibility, and the glycerin method would probably be used to do this. When this can be done completely and successfully, science will have moved much closer to its aim of freezing and storing incurable patients until the day they can be cured.

56.The passage is mainly about ___________.

      A.the possibility of preserving human bodies by freezing

      B.the practice of preserving food by freezing

      C.the harmful effects of freezing

      D.how to remove water from living cells

57.The idea of freezing human bodies to preserve them ___________.

      A.comes from that of keeping meat and fruit fresh by freezing

      B.was invented in ancient China

      C.could hardly be realized by people

      D.is widely accepted by the scientific world

58.According to the passage, freezing is___________.

      A.the best way of preserving food

      B.a way of removing water from living cells

      C.a way of realizing the idea of preserving human bodies

      D.harmful to living cells and cannot be used to preserve them

59.Glycerin can be used ___________.

      A.to freeze only chicken’s living cells

      B.to unfreeze living cells

      C.to remove water from living cells

      D.to change the shapes of crystals

60.The success achieved by Dr Luyet and his helpers was a long step towards ___________.

      A.keeping meat or fruit fresh

      B.living forever

      C.changing the shapes of ice crystals

      D.preserving human bodies for long periods

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读写任务(共1小题;满分25分)
阅读下面的短文,然后按照要求写一篇150词左右的英语短文。
In the atmosphere, carbon dioxide acts rather like a one-way mirror —— the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.
According to a weather expert’s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of earth's chief food-growing zones.
In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.
Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.
However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weather?
【写作内容】
1.以约30个词概括短文的要点;
2. 然后以约120个词就“Solutions of slowing climate change”为主题写一篇短文,包括如下要点:
(1) 你认为地球会不会持续变暖;
(2) 其原因是什么以及人类在其中的作用;
(3) 谈谈你的建议。
【写作要求】
(1) 你可以使用实例或者其他论述方法支持你的观点,也可以参照阅读材料的内容,但不得直接引用阅读材料中的句子。
(2) 字迹清楚,书写工整。
【评分标准】 概括准确,语言规范,内容合适,篇章连贯。

查看习题详情和答案>>

读写任务(共1小题;满分25分)

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

In the atmosphere, carbon dioxide acts rather like a one-way mirror —— the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.

According to a weather expert’s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of earth's chief food-growing zones.

In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.

Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.

However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weather?

【写作内容】

1.以约30个词概括短文的要点;

2. 然后以约120个词就“Solutions of slowing climate change”为主题写一篇短文,包括如下要点:

(1) 你认为地球会不会持续变暖;

(2) 其原因是什么以及人类在其中的作用;

(3) 谈谈你的建议。

【写作要求】

(1) 你可以使用实例或者其他论述方法支持你的观点,也可以参照阅读材料的内容,但不得直接引用阅读材料中的句子。

(2) 字迹清楚,书写工整。

【评分标准】 概括准确,语言规范,内容合适,篇章连贯。

 

查看习题详情和答案>>

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