Dye can bring a little color to life. Most clothing is colored with dyes. Modern, manufactured dyes can be costly. Natural dyes from plant and animal products have been used since ancient times. So th 题目和参考答案——青夏教育精英家教网—

题目内容

There are several methods to put dye onto material. The vat method, for example, can be used to dye wool with onionskins. For this example, use one hundred grams of natural wool. The wool must be clean. Leave it overnight in water and liquid soap. Then wash it with clean water that is a little warm. Gently squeeze out the extra water.

A solution called a mordant (媒染) is used in the dying process. A mordant helps fix the dye to the material. Traditionally, mordants were found in nature. Wool ash is one example. But chemical mordants such as alum are popular today. Alum is sold in many stores. It is often mixed with cream of tartar, a fine powder commonly used in cooking.

Mix eight grams of alum with seven grams of cream of tartar in a small amount of hot water. Add the solution to a metal pan of cool water. Next, add the wool and place the mixture over heat. Slowly bring the liquid to eighty-two degrees Celsius. Heat the mixture for forty-five minutes. After it cools, remove the wool and wash it.

To prepare the dye solution, cover thirty grams of onionskins with water. Use only the dry, brown outer skins. Boil the liquid until the onionskins lose their color, about forty-five minutes. Remove the skins after the dye cools.

Now it is time to dye the wool. Place the wool into the dye and heat the mixture. Bring it to a boil, then immediately reduce the heat to eighty-two degrees. Now heat the dye for about forty-five minutes or until the wool is the desired color. Keep in mind that wet wool looks darker than it is.

Once the dye cools, remove the wool and wash it. Now the wool is orange or yellow. Or at least it should be.

57. According to the passage, mordants are ________.

A. dyes used in the dying process

B. materials which will be put dye to

C. wood ashes used in the dying process

D. not dyes but play an important role in the dying process

58. Which of the following statements about “natural dyes” is true?

A. They might be cheaper than chemical dyes.

B. They are more expensive than chemical dyes.

C. They have been used for only recent years.

D. They are all made from animal products.

59. As for the vat method, which of the following statements is NOT necessarily needed?

A. Ash. B. Water. C. Mordant. D. Temperature.

60. Choose the proper order of dying wool:

a. boil the liquid with onionskins.

b. add mordants to a metal pan of cool water.

c. wash the wool with clean water.

d. put the wool into the liquid and heat it

e. heat the mixture and then wash it.

A. c, b, e, a, d B. e, b, c, d, a C. b, e, a, d, c D. a, b, e, c, d

【答案】

57---60 DAAA

【解析】略

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Dye (染料) can bring a little color to life. Most clothing is colored with dyes. Modern, manufactured dyes can be costly. Natural dyes from plant and animal products have been used since ancient times. So this week, we describe a natural way to dye wool.
There are several methods to put dye onto material. The vat method, for example, can be used to dye wool with onionskins. For this example, use one hundred grams of natural wool. The wool must be clean. Leave it overnight in water and liquid soap. Then wash it with clean water that is a little warm. Gently squeeze out the extra water.
A solution called a mordant (媒染) is used in the dying process. A mordant helps fix the dye to the material. Traditionally, mordants were found in nature. Wool ash is one example. But chemical mordants such as alum are popular today. Alum is sold in many stores. It is often mixed with cream of tartar, a fine powder commonly used in cooking.
Mix eight grams of alum with seven grams of cream of tartar in a small amount of hot water. Add the solution to a metal pan of cool water. Next, add the wool and place the mixture over heat. Slowly bring the liquid to eighty-two degrees Celsius. Heat the mixture for forty-five minutes. After it cools, remove the wool and wash it.
To prepare the dye solution, cover thirty grams of onionskins with water. Use only the dry, brown outer skins. Boil the liquid until the onionskins lose their color, about forty-five minutes. Remove the skins after the dye cools.
Now it is time to dye the wool. Place the wool into the dye and heat the mixture. Bring it to a boil, then immediately reduce the heat to eighty-two degrees. Now heat the dye for about forty-five minutes or until the wool is the desired color. Keep in mind that wet wool looks darker than it is.
Once the dye cools, remove the wool and wash it. Now the wool is orange or yellow. Or at least it should be.
57. According to the passage, mordants are ________.
A. dyes used in the dying process
B. materials which will be put dye to
C. wood ashes used in the dying process
D. not dyes but play an important role in the dying process
58. Which of the following statements about “natural dyes” is true?
A. They might be cheaper than chemical dyes.
B. They are more expensive than chemical dyes.
C. They have been used for only recent years.
D. They are all made from animal products.
59. As for the vat method, which of the following statements is NOT necessarily needed?
A. Ash. B. Water. C. Mordant. D. Temperature.
60. Choose the proper order of dying wool:
a. boil the liquid with onionskins.
b. add mordants to a metal pan of cool water.
c. wash the wool with clean water.
d. put the wool into the liquid and heat it
e. heat the mixture and then wash it.
A. c, b, e, a, d B. e, b, c, d, a C. b, e, a, d, c D. a, b, e, c, d

On Saturday, millions of people around the world will celebrate Saint Patrick’s Day, which honors Patron Saint (or main religious figure) of Ireland. Communities across the United States will host parades, parties, and other festivities to mark the occasion.
This year, cities like Boston, New York, and Chicago have organized massive events celebrating Saint Patrick’s Day. In New York City, hundreds of thousands of people will gather to watch the Saint Patrick’s Day parade—the nation’s largest. It is one of the most watched parades in the world. Last year, almost 2 million spectators（观众） and more than 150,000 participants （参与者）filled the streets. The parade, first held in 1776, is also one of the oldest.
Chicago also throws a big celebration. Every year, the Chicago River, which crosses the city, glows green as event organizers dump about 40 pounds of fluorescence, a powerful dye(染料), into the water.
Boston keeps its parade rolling for three hours or more. It is the nation’s second-largest parade. The city will also salute one of its most famous former residents, President John F. Kennedy, by opening the exhibit “A Journey Home: John F. Kennedy and Ireland,” at his official library.
Patron Saint lived in Britain in the early fifth century, when it was still part of the Roman Empire. He was captured （抓捕）and sold into slavery（卖为奴隶） in Ireland when he was only 16．He eventually escaped slavery and turned to a life of religious devotion. He trained to become a minister（牧师） and set out to spread Christianity throughout Ireland. After 30 years as a religious leader, Patrick died on March 17, 1461．Saint Patrick’s Day is always celebrated on March 17．In Ireland, it is an official holiday.
1．What’s the best title of the passage?
A．History of Saint Patrick’s Day                  B．An Official Holiday in US
C．The Largest Parade in the World                D．Celebrations across the Country
2．What do you think is the official color of St. Patrick’s Day?
A．Green                  B．Red.                    C．Black.                  D．Yellow.
3．The last paragraph is mainly about _____.
A．the cruel slave trade.                        B．Saint Patrick’s contribution.
C．activities during Saint Patrick’s Day       D．Ireland’s Patron Saint
4．Which of the following is not correct according to the passage?
A．Parade is a most important event to observe Saint Patrick’s Day.
B．Saint Patrick’s Day is a religious holiday.
C．Saluting the former president has become a main event on the occasion.
D．The Saint Patrick’s Day parade has a history of over two centuries.

This year, cities like Boston, New York, and Chicago have organized massive events celebrating Saint Patrick’s Day. In New York City, hundreds of thousands of people will gather to watch the Saint Patrick’s Day parade—the nation’s largest. It is one of the most watched parades in the world. Last year, almost 2 million spectators（观众） and more than 150,000 participants （参与者）filled the streets. The parade, first held in 1776, is also one of the oldest.

Chicago also throws a big celebration. Every year, the Chicago River, which crosses the city, glows green as event organizers dump about 40 pounds of fluorescence, a powerful dye(染料), into the water.

Boston keeps its parade rolling for three hours or more. It is the nation’s second-largest parade. The city will also salute one of its most famous former residents, President John F. Kennedy, by opening the exhibit “A Journey Home: John F. Kennedy and Ireland,” at his official library.

Patron Saint lived in Britain in the early fifth century, when it was still part of the Roman Empire. He was captured （抓捕）and sold into slavery（卖为奴隶） in Ireland when he was only 16．He eventually escaped slavery and turned to a life of religious devotion. He trained to become a minister（牧师） and set out to spread Christianity throughout Ireland. After 30 years as a religious leader, Patrick died on March 17, 1461．Saint Patrick’s Day is always celebrated on March 17．In Ireland, it is an official holiday.

1．What’s the best title of the passage?

A．History of Saint Patrick’s Day B．An Official Holiday in US

C．The Largest Parade in the World D．Celebrations across the Country

2．What do you think is the official color of St. Patrick’s Day?

A．Green B．Red. C．Black. D．Yellow.

3．The last paragraph is mainly about _____.

A．the cruel slave trade. B．Saint Patrick’s contribution.

C．activities during Saint Patrick’s Day D．Ireland’s Patron Saint

4．Which of the following is not correct according to the passage?

A．Parade is a most important event to observe Saint Patrick’s Day.

B．Saint Patrick’s Day is a religious holiday.

C．Saluting the former president has become a main event on the occasion.

D．The Saint Patrick’s Day parade has a history of over two centuries.

Dye (染料) call bring a little colour to life. Most clothing is coloured with dyes. Modern，manufactured dyes can be costly. Natural dyes from plant and animal products have been used since ancient times. Here we describe a natural way to dye wool.

There are several methods to put dye onto material. The vat（缸）method，for example，can be used to dye wool with onionskins. For this example，use one hundred grams of natural woo1. The wool must be clean. Leave it overnight in water and liquid soap. Then wash it with clean water that is a little warm. Gently squeeze out the extra water.

A solution called a mordant (媒染) is used in the dying process. A mordant helps fix the dye to the material. Traditionally, mordants were found in nature. Wood ash is one example. But chemical mordants such as alum（矾）are popular today. Alum is sold in many stores. It is often mixed with cream of tartar, a fine powder commonly used in cooking.

Mix eight grams of alum with seven grams of cream of tartar in a small amount of hot water. Add the solution to a metal pan of cool water. Next, add the wool and place the mixture over heat. Slowly bring the liquid to eighty-two degrees Celsius. Heat the mixture for forty five minutes. After it cools, remove the wool and wash it.

To prepare the dye solution, cover thirty grams of onionskins with water. Use only the dry，brown outer skins. Boil the liquid until the onionskins lose their colour, about forty—five minutes. Remove the skins after the dye cools.

Now it is time to dye the wool. Place the wool into the dye and heat the mixture. Bring it to a boil，then immediately reduce the heat to eighty-two degrees. Now heat the dye for about forty-five minutes or until the wool is the desired colour. Keep in mind that wet wool looks darker than it is.

Once the dye cools, remove the wool and wash it. Now the wool is orange or yellow. Or at least it should be.

1. According to the passage, mordants are ___________.

A. dyes used in the dying process B. materials which will be put dye to

C. wood ashes used in the dying process D. not dyes but play an important role in the dying process

2. Which of the following statements about “natural dyes” is TRUE?

A. They might be cheaper than chemical dyes. B. They are more expensive than chemical dyes.

C. They have been used for only recent years. D. They are all made from animal products.

3. As for the vat method，which of the following things is NOT necessarily needed?

A. Ash. B. Water. C. Mordant. D. Temperature.

4. Choose the proper order of dying wool：

a. boil the liquid with onionskins

b. add mordants to a metal pan of cool water ,put the wool into it and heat the mixture

c. wash the wool with clean water after it is left overnight in water and liquid soap

d. put the wool into the dye and heat it

A. c, b, a, d B. d, c, d, a C. b, a, d, c D. a, b, c, d

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