Units of measurement are often used in their abbreviated forms in the international trade, "Ib" refers to （)

Study the following abbreviated essay outline. Then choose the most appropriate concluding paragraph. When computing technology is making an ever-increasing impact on many aspects of the production and life of mankind, computers have been widely applied in almost every field. However, the question of whether there are more benefits than drawbacks for young children using a computer everyday has triggered a wide debate. As far as I am concerned, I tend to believe that the advantages outweigh disadvantages for the following reasons. For one thing, in modern society, computer is used in many different fields such as health, education and business. It has become an indispensable part in our life… For another thing, some computer knowledge is required for the job, so great importance should be attached to it. Some people consider that it is not good for children to use computer everyday, because sitting in front of a screen for too long can damage both the eyes and the physical posture of young children. But we can cope with this problem by limiting the time of using computers and giving proper supervision for them… ...

A、Although, to some extent, computers have brought people great convenience in getting information, entertainment and contact with others, especially for those businessmen, for those youngsters, typically those teenagers who are not rational enough to control themselves, computers should not be allowed to intrude into their daily life.

B、All in all, everything has two sides. Whether computers will do us good or harm all depend on how we use them.

C、In conclusion, I strongly believe that using computer everyday brings more benefits than drawbacks to young children. The most important aspect depends on that the young children need proper guidance.

D、To sum up, computers benefit young children a lot and also bring about some negative influence on children.

King Juan Carlos of Spain once insisted “kings don’t abdicate, they dare in their sleep.” But embarrassing scandals and the popularity of the republican left in the recent Euro-elections have forced him to eat his words and stand down. So, does the Spanish crisis suggest that monarchy is seeing its last days? Does that mean the writing is on the wall for all European royals, with their magnificent uniforms and majestic lifestyle?

The Spanish case provides arguments both for and against monarchy. When public opinion is particularly polarised, as it was following the end of the Franco regime, monarchs can rise above “mere” politics and “embody” a spirit of national unity.

It is this apparent transcendence of politics that explains monarchs’ continuing popularity polarized. And also, the Middle East excepted, Europe is the most monarch-infested region in the world, with 10 kingdoms (not counting Vatican City and Andorra). But unlike their absolutist counterparts in the Gulf and Asia, most royal families have survived because they allow voters to avoid the difficult search for a non-controversial but respected public figure.

Even so, kings and queens undoubtedly have a downside. Symbolic of national unity as they claim to be, their very history—and sometimes the way they behave today – embodies outdated and indefensible privileges and inequalities. At a time when Thomas Piketty and other economists are warning of rising inequality and the increasing power of inherited wealth, it is bizarre that wealthy aristocratic families should still be the symbolic heart of modern democratic states.

The most successful monarchies strive to abandon or hide their old aristocratic ways. Princes and princesses have day-jobs and ride bicycles, not horses (or helicopters). Even so, these are wealthy families who party with the international 1%, and media intrusiveness makes it increasingly difficult to maintain the right image.

While Europe’s monarchies will no doubt be smart enough to survive for some time to come, it is the British royals who have most to fear from the Spanish example.

It is only the Queen who has preserved the monarchy’s reputation with her rather ordinary (if well-heeled) granny style. The danger will come with Charles, who has both an expensive taste of lifestyle. and a pretty hierarchical view of the world. He has failed to understand that monarchies have largely survived because they provide a service – as non-controversial and non-political heads of state. Charles ought to know that as English history shows, it is kings, not republicans, who are the monarchy’s worst enemies.

21. According to the first two Paragraphs, King Juan Carlos of Spain

A.used turn enjoy high public support

B.was unpopular among European royals

C.cased his relationship with his rivals

D.ended his reign in embarrassment

Which of the following is the best title of the text?A.Carlos, Glory and Disgrace Combined

B.Charles, Anxious to Succeed to the Throne

C.Carlos, a Lesson for All European Monarchs

D.Charles, Slow to React to the Coming Threats

Which of the following is shown to be odd, according to Paragraph 4?

A.Aristocrats’ excessive reliance on inherited wealth

B.The role of the nobility in modern democracies

C.The simple lifestyle of the aristocratic families

D.The nobility’s adherence to their privileges

The British royals “have most to fear” because CharlesA.takes a rough line on political issues

B.fails to change his lifestyle as advised

C.takes republicans as his potential allies

D.fails to adapt himself to his future role

Monarchs are kept as heads of state in Europe mostlyA.owing to their undoubted and respectable status

B.to achieve a balance between tradition and reality

C.to give voter more public figures to look up to

D.due to their everlasting political embodiment

请帮忙给出每个问题的正确答案和分析，谢谢！

Diamonds are just carbon in its most concentrated form, the element that makes up 18 percent of the weight of your body. There is no other gemstone as cherished as the diamond, but in truth, diamonds are no rarer than many other precious gems. They continue to demand higher market prices because the majority of the diamond market is controlled by a single entity.

The Origin of Diamonds

Carbon is one of the most common elements in the world, and is one of the four essentials for the existence of life. Humans are more than 18-percent carbon. When occurring in nature, carbon exists in three basic forms, of which diamond is an extremely hard, clear crystal.

Diamonds form. about 161 km below the Earth's surface, in the molten rock of the Earth's mantle, which provides the right amounts of pressure and heat to transform. carbon into a diamond. In order for a diamond to be created, carbon must be placed under at least 435,113 pounds per square inch (psi) of pressure at a temperature of at least 400 Celsius. If conditions drop below either of these two points, graphite will be created. At depths of 150 km or more, pressure builds to about 725,189 psi and heat can exceed 1,200 C.

Kimberlite Pipes

Most diamonds that we see today were formed millions (if not billions) of years ago. Powerful magma eruptions brought the diamonds to the surface, creating kimberlite pipes. Kimberlite is named after Kimberly, South Africa, where these pipes were first found. Most of these eruptions occurred between 1,100 million and 20 million years ago.

Kimberlite pipes are created as magma (岩浆) flows through deep fractures in the Earth. The magma inside the kimberlite pipes acts like an elevator, pushing the diamonds and other rocks and minerals through the mantle and crust in just a few hours. These eruptions were short, but many times more powerful than volcanic eruptions that happen today.

The magma eventually cooled inside these kimberlite pipes, leaving behind conical veins of kimberlite rock that contain diamonds. Kimberlite is a bluish rock that diamond miners look for when seeking out new diamond deposits. The surface area of diamond-bearing kimberlite pipes ranges from 2 to 146 hectares. Diamonds may also be found in river beds, which are called alluvial diamond sites. These are diamonds that originate in kimberlite pipes, but get moved by geological activity. Glaciers and water can also move diamonds thousands of miles from their original location.

Cutting Diamonds

There are special techniques that are used to cut and shape a diamond before it gets to the jewelry store. Diamond cutters first try to remove any impurities or irregularities in the diamond. Sometimes, diamonds have to be sawed with the use of a phosphor-bronze blade or laser. Then the diamond is rubbed by another diamond to create facets-tiny flat spots on the surface. Finally, the diamond is pressed against a rotating polishing wheel to give the diamond its finished look.

Rating Diamonds

Diamonds are judged on several factors that determine their beauty. Most diamonds never reach the consumer market because they are too flawed. Often, these diamonds are used for industrial purposes--as an abrasive, for drill bits or for cutting diamonds and other gems. If you've ever purchased a diamond, you've heard of the "4 Cs:"

1. Cut--This refers to how the diamond has been cut and its geometric proportions. When a diamond is cut, facets are created and the diamond's finished shape is determined.

2. Clarity

A．Y

B．N

C．NG

King Juan Carlos of Spain once insisted “kings don’t abdicate, they dare in their sleep.” But embarrassing scandals and the popularity of the republican left in the recent Euro-elections have forced him to eat his words and stand down. So, does the Spanish crisis suggest that monarchy is seeing its last days? Does that mean the writing is on the wall for all European royals, with their magnificent uniforms and majestic lifestyle?

The Spanish case provides arguments both for and against monarchy. When public opinion is particularly polarised, as it was following the end of the Franco regime, monarchs can rise above “mere” politics and “embody” a spirit of national unity.

It is this apparent transcendence of politics that explains monarchs’ continuing popularity polarized. And also, the Middle East excepted, Europe is the most monarch-infested region in the world, with 10 kingdoms (not counting Vatican City and Andorra). But unlike their absolutist counterparts in the Gulf and Asia, most royal families have survived because they allow voters to avoid the difficult search for a non-controversial but respected public figure.

Even so, kings and queens undoubtedly have a downside. Symbolic of national unity as they claim to be, their very history—and sometimes the way they behave today – embodies outdated and indefensible privileges and inequalities. At a time when Thomas Piketty and other economists are warning of rising inequality and the increasing power of inherited wealth, it is bizarre that wealthy aristocratic families should still be the symbolic heart of modern democratic states.

The most successful monarchies strive to abandon or hide their old aristocratic ways. Princes and princesses have day-jobs and ride bicycles, not horses (or helicopters). Even so, these are wealthy families who party with the international 1%, and media intrusiveness makes it increasingly difficult to maintain the right image.

While Europe’s monarchies will no doubt be smart enough to survive for some time to come, it is the British royals who have most to fear from the Spanish example.

It is only the Queen who has preserved the monarchy’s reputation with her rather ordinary (if well-heeled) granny style. The danger will come with Charles, who has both an expensive taste of lifestyle. and a pretty hierarchical view of the world. He has failed to understand that monarchies have largely survived because they provide a service – as non-controversial and non-political heads of state. Charles ought to know that as English history shows, it is kings, not republicans, who are the monarchy’s worst enemies.

21. According to the first two Paragraphs, King Juan Carlos of Spain

[A] used turn enjoy high public support

[B] was unpopular among European royals

[C] cased his relationship with his rivals

[D]ended his reign in embarrassment

22. Monarchs are kept as heads of state in Europe mostly

[A] owing to their undoubted and respectable status

[B] to achieve a balance between tradition and reality

[C] to give voter more public figures to look up to

[D]due to their everlasting political embodiment

23. Which of the following is shown to be odd, according to Paragraph 4?

[A] Aristocrats’ excessive reliance on inherited wealth

[B] The role of the nobility in modern democracies

[C] The simple lifestyle. of the aristocratic families

[D]The nobility’s adherence to their privileges

24. The British royals “have most to fear” because Charles

[A] takes a rough line on political issues

[B] fails to change his lifestyle. as advised

[C] takes republicans as his potential allies

[D] fails to adapt himself to his future role

25. Which of the following is the best title of the text?

[A] Carlos, Glory and Disgrace Combined

[B] Charles, Anxious to Succeed to the Throne

[C] Carlos, a Lesson for All European Monarchs

[D]Charles, Slow to React to the Coming Threats