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Centuries ago, man discovered that removing moisture from food helps to preserve it, and t

hat the easiest way to do this is to expose the food to sun and wind.

All foods contain water--cabbage and other leaf vegetables contain as much as 93% water, potatoes and other root vegetables 80% , lean meat 75% and fish anything from 80% to 60% depending on how fatty it is. If this water is removed, the activity of the bacteria(细菌) which cause food to go bad is checked.

Nowadays most foods are dried mechanically. The conventional method of such dehydration(脱水) is to put food in chambers through which hoi air is blown at temperatures of about 110°C at entry to about 43°C at exit. This is the usual method for drying such things as vegetables, minced meat, and fish.

Liquids such as milk, coffee, tea, soups and eggs may be dried by pouring them over a heated horizontal steel cylinder or by spraying them into a chamber through which a current of hot air passes. In the first case, the dried material is scraped off the roller as a thin film which is then broken up into small, though still relatively coarse flakes. In the second process it falls to the bottom of the chamber as a fine powder.

Dried foods 'take up less room and weigh less than the same food packed in cans or frozen, and they do not need to be stored in special conditions. For these reasons they are invaluable to climbers, explorers and soldiers in battle, who have little storage space. They are also popular with housewives because it takes so little time to cook them.

The chief point of the second paragraph is about ______.

A．the comparison of lean meat and fish

B．the removal of water in food

C．the water content in food

D．the relationship between water and food

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更多“Centuries ago, man discovered …”相关的问题

第1题

Fireworks, ______ originated centuries ago in China, were brought to Europe by Marco Polo.

A．which

B．what

C．that

D．it

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第2题

Crocodiles（鳄鱼)lay their eggs and leave them under leaves or sand. Baby crocodiles have s

Crocodiles(鳄鱼)lay their eggs and leave them under leaves or sand. Baby crocodiles have special sharp teeth with which to break their way out of the shells. Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time lying around in the mud or the rivers. The crocodiles long powerful tail is used when the animal is swimming. It is also an excellent weapon, because it can be swung with great speed and force. One blow will knock down a man or even a big animal at once. The crocodile is very well protected against its enemies by the hard bony plates which cover most of its body, but because of the way its neck is formed, it cannot turn its head from side to side and so it can only see in front of itself. The crocodile has its teeth cleaned by the crocodile bird. For its food this bird takes the bits left in the crocodiles mouth. This helps the crocodile, which cannot clean its own teeth, for it cannot move its tongue up and down. With its rows of terrible pointed teeth it seizes its food, which may be a fish, an animal, or even a careless human being, and then holds it below the water until it is drown to death. The long-nosed crocodile is shy and timid and because of this, the people of West Africa where it lives, sometimes catch it for food. Many, many centuries ago there were crocodiles in England. We know this because we have found their bones buried far down in the earth on which London is built. But the Britain of today is too cold for them to live in. Crocodiles may grow to over thirty feet in length. When they lie floating in the water, they look like floating tree-trunks and it is often impossible to tell that they are there.

The female crocodile______.

A．buries her eggs

B．sits on her eggs

C．carries her eggs

D．eats her eggs

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第3题

Man's forehead will grow larger because______. A he will use of only about 20% of the

Man's forehead will grow larger because______.

A he will use of only about 20% of the brain's capacity

B the other 80% of his brain will grow in due time

C he had rather narrow forehead a few hundred years ago

D he will have to use his brain more and more as time goes on

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第4题

From the beginning rivers have played an important part in the life of man. Man of the ear

liest times used the rivers as a means of travel. Today rivers still serve as a great waterway for the transport and people.

In ancient times, man settled near rivers or on fiver banks and built up large empires.

Water is Nature’s most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations all over the world rivers mean life and wealth. They feed and clothe the nations around them.

Water is also a source of energy and power. Man constructs huge dams across the river to control the water for irrigation and get the energy needed to drive generators. The electrical power is then directed to homes, cities, factories and television stations.

Man uses water each day. His main source of water comes from reservoirs, which in turn get their water from the rivers.

Rivers also bring down soil and minerals from the mountains and deposit them on the plains building up rich fiver deltas for raising plants and crops. Fresh water life in rivers or in lakes fed by them provide man with food.

In a small way rivers help to keep man in good health and provide for his amusements. Various forms of water sports keep man strong and healthy.

Rivers have run on this earth long before man. Man’s future ability to live is uncertain, but rivers will flow on forever.

Rivers have been important to man ______.

A．since the last century

B．for a very long time

C．since a few hundred years ago

D．since a few years ago

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第5题

From the beginning rivers have played an important part in the life of man. Man of the ear

liest times used the rivers as a means of travel. Today rivers still serve as a great waterway for the transport and people.

In ancient times, man settled near rivers or on river banks and built up large empires.

Water is Nature's most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations all over the world rivers mean life and wealth. They feed and clothe the nations around them.

Water is also a source of energy and power. Man constructs huge dams across the river to control the water for irrigation and get the energy needed to drive generators. The electrical power is then directed to homes, cities, factories and television stations.

Man uses water each day. His main source of water comes from reservoirs, which in turn get their water from the rivers.

Rivers also bring down soil and minerals from the mountains and deposit them on the plains building up rich river deltas for raising plants and crops. Fresh water life in rivers or in lakes fed by them provide man with food.

In a small way rivers help to keep man in good health and provide for his amusements. Various forms of water sports keep man strong and healthy.

Rivers have run on this earth long before man. Man's future ability to live is uncertain, but rivers will flow on forever.

Rivers have been important to man ______.

A．since the last century

B．for a very long time

C．since a few hundred years ago

D．since a few years ago

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第6题

From the beginning rivers have played an important part in the life of man. Man of the ear

liest times used the rivers as a means of traveling. Today rivers still serve as a great waterway for the transport and people.

In ancient times, man settled near rivers or on river banks and built up large empires.

Water is the Nature's most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations all over the world rivers mean life and wealth. They feed and clothe the nations around them.

Water is also a source of energy and power. Man constructs huge dams across the river to control the water for irrigation and get the energy needed to drive generators. The electrical power is then directed to homes, cities, factories and television stations.

Man uses water each day. His main source of water comes from reservoirs, which in turn get their water from the rivers.

Rivers also bring down soil and minerals from the mountains and deposit them on the plains building up rich river deltas for raising plants and crops. Fresh water life in rivers or in lakes fed by them provide man with food.

In a small way rivers help to keep man in good health and provide for his amusements. Various forms of water sports keep man strong and healthy.

Rivers have run on this earth long before man. Man's future ability to live is uncertain, but rivers will flow on forever.

Rivers have been important to man______.

A．since the last century

B．for a very long time

C．since a few hundred years ago

D．since a few years ago

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第7题

回答下列各题 B Not long ago a California policeman stopped a driver for failing to

回答下列各题 B

Not long ago a California policeman stopped a driver for failing to stop at a red light．Asked his name，the driver said，“Safety First．”0f course，the policeman did not believe the man．He thought the driver had been drinking．But the man was telling the truth．Safety First was his real name．Thousands of babies are given strange names each year，and many women acquire(获得)strange names through marriage．When Miss Nova Warrick married,she became Nova Cain．There’s a Katz Meow in Washington D．C．and a Mr．Ache Payne in Illinois．Mr．Darling Dear resides(居住)in Wisconsin．A New York music teacher is named Love Sweet‘ heart．Fish Hook lives in Illinois．Orange Vanilla Lemon resides in Idaho．But，perhaps the strangest name of all is that of a Georgia man—W·5／8ths Smith． The policeman stopped the driver to________．

A.ask him some questions about his family name

B.check whether the driver kept the traffic rules in mind

C.find out the cause that made the driver broke the traffic rules

D.I hake sure if the driver would cheat him

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第8题

根据内容回答下列各题.Not long ago, there lived in Auckland a working family who dreamed ab

根据内容回答下列各题.

Not long ago, there lived in Auckland a working family who dreamed about a house of their own. Anyone then could read in the newspapers about the building companies who offered to put people into a new house 51 only a $1,000 deposit. Of course, the remainder had to be paid off with interest over a period of twenty years or so.

The worker and his wife hopefully went to one of these companies 52 this wonderful offer. And the man in the office said．“Yes, sure. You bring along $1,000 and we can 53 you with a new house.” So the worker and his wife had to work hard and in twelve months’ time they returned to the building man with $1,000. But the man in the office said, “Look, I’m sorry, 54 we’ll need $1,500 now. Costs have gone up since we saw you last, you know.”

The couple thought it over and decided it would not take very long to save the extra $500 if they worked hard. In six moths they worked 55 overtime and saved the $500 in spite of the high rent they had to pay for their flat. Back to the building man they 56 with their $1,500. But to their surprise he 57 the deposit was now $3,000. Now somewhat wiser, the worker said, “And the next time, I dare say we’ll find the deposit rising once more. How have we 58 save the extra $1,500？” “Well”, said the man, “I think we can stabilize the situation for about twelve months. By the time you come with $3,000, we will have had the house 59 for you.

The couple left, sad at heart as they saw their dream house 60 . By the time they had saved the extra $1.500, no doubt the deposit would have become still higher, maybe $5,000, then $10,000 and then…!

51.

A.for

B.with

C.on

D.to

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第9题

Social customs and ways of behaving change. Things which were considered impolite many yea

rs ago are now acceptable. Just a few years ago, it was considered impolite behaviour for a man to smoke on the street. No man who thought of himself as being a gentleman would make a fool of himself by smoking when a lady was in a room.

Customs are also different from country to country. Does a man walk on the left or the right of a woman in your country？ Or doesn't it matter？ What about table manner？ Should you use both hands when you are eating？

The Americans and the British not only speak the same language but also share a large number of social customs. For example, in both America and England people shake hands when they meet each other for the first time. Also, most Englishmen will open a door for a woman or offer their seat to a woman, and so will most Americans. Promptness is important both in England and in America. That is, if a dinner invitation is for 7 o'clock, the dinner guest either arrives close to that time or calls up to explain his delay.

The important thing to remember about social customs is not to do anything that might make other people feel uncomfortable---especially if they are your guests. There is an old story about a man who gave a dinner party. When the food was served, one of the guests started to eat his peas with a knife. The other guests were amused or shocked, but the host calmly picked up his knife and began eating in the same way. It would have been bad manners to make his guest feel foolish or uncomfortable.

If one has accepted a dinner invitation, what should he do if he is to be late for the dinner？

A．He should find an excuse.

B．He should ask for excuse.

C．He should say "Sorry"

D．He should telephone to explain his being late.

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第10题

We have no idea as to when men began to use salt, but we do know that it has been used m m

any different ways throughout the history.

For example, it is recorded in many history books that people who lived over 3000 years ago ate salted fish. Thousands of years ago in Egypt, salt was used to preserve the dead.

In some periods of history, a person who stole salt was thought to have broken the law. Take the eighteenth century for example, if a person was caught stealing salt, he would be thrown into prison. History also records that only in England about ten thousand people were put into prison during that century for stealing salt! About 450 years ago, in the year 1553, if a man took more than his share of salt, he would be thought to have broken the law and would be seriously punished. The offender's ear was cut off.

Salt was an important item on the dinner table of a king. It was always put in front of the king when he sat down to eat. Important guests at the king's table were seated near the salt. Less important guests were given seats farther away from it.

Thousands of years ago in Egypt salt was used ______.

A．to punish people who had broken the law

B．to keep dead bodies from decay

C．to keep fish alive

D．to make chemicals

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第11题

Chinese wedding tea ceremony is a tradition that dates back to many centuries ago and is

still widely practiced at modern Chinese weddings on the wedding day，either at home or at the banquet.It is an official ritual to introduce the newlyweds to each other’s family，and is also a way to show respect and appreciation (感谢) to their parents. Tea is likely served also because it is the national drink of China.

When the tea itself is served，the newlyweds kneel in front of their parents，serving tea to both sides of parents，as well as elder close relatives. Parents give their words of blessing and gifts to the newlyweds. During tea presentation，a “good luck woman” would say lucky phrases to bless the newlyweds and the parents. This “good luck woman” should be someone who is blessed with

a good marriage，healthy children and husband，and living parents.

Newlyweds also present tea to each other，raising the tea cups high to show respect before presenting to each other.

依照文章判断正误(对的写T;错误写F)

() 1. Tea ceremony is a way to show respect and appreciation to the newlyweds’ parents. () 2. Tea ceremony is only practiced at the banquet.

() 3. The “good luck woman” must be the one with a good marriage，healthy children and

husband，and living parents.

() 4. During tea presentation，the newlyweds will receive gifts from their parents.

() 5. Tea ceremony tradition has a long history of several hundred years.

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