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Gold used in jewelry is mixed with harder metals to add strength and durability. The metals added can also be used to change gold" s color， giving it a fashionable rose or white tint， or to lighten or darken the natural yellow， tone of pure gold.Mixtures like these， of less costly metals with more valuable ones， are called alloys. Copper and silver are the most common metals mixed with gold to make yellow gold jewelry. White gold is usually made with an alloy of gold and nickel.

The measure of gold" s purity is called a karat. The higher the karat rating，the higher the amount of pure gold: 24 karat is pure gold，18 karat is 75% pure gold，14 karat is 58.5% pure gold， and 9 karat is 37.5% pure gold. All other things being equal ，the higher the percentage of pure gold used in the alloy，the more valuable and expensive the jewelry wll be.

Gold jewelry pieces are usually stamped with a marking to identify the karat amount. While gold that is 24K is too soft for jewelry，18K，14K and 9K gold are all appropriate for jewelry， and they all make pieces that look great and wear beautifully.

Which of the following statements best.captures the main idea of this passage? 查看材料

你（Li Yuan）听说你的好朋友（Mike）通过了考试，可以上大学了。发一封电子邮件表示祝贺。邮件的内容如下：

（1）表示祝贺；

（2）祝贺的方式。

________

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________

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根据下面内容，回答题：

A. I prefer

B. that"s OK

C. I"d love to

D. What do you like

E. Would you like to go

F. That sounds fine

G. cannot work

H. have to work late

Dave: I have tickets to The Phantom of the Opera on Friday night.56?

Susan: Thanks.57. What time is the show?

Dave: It"s at 8:00.

Susan: That sounds great. So， do you want to have dinner at 6:007

Dave: Uh， I"d like to， but I58.

Susan: Oh，59Let"s just meet at the theater before the show， around 7:30.

Dave :60

________

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The judging panel________. 查看材料

The consistent quality of the prize________. 查看材料

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The Man Booker Prize for Fiction is awarded every year for a novel written by a writer from the Commonwealth or the Republic of Ireland and it aims to represent the very best in contemporary fiction. The prize was originally called the Booker-McConnell Prize， which was the name of the company that sponsored it， though it was better-known as simply the "Booker Prize". In 2002， the Man Group became the sponsor and they chose the new name， keeping "Booker".

Publishers can submit books for consideration for the prize， but the judges can also ask for books to be submitted they think should be included. Firstly， the Advisory Committee give advice if there have been any changes to the rules for the prize and selects the people who will judge the books. The judging panel changes every year and usually a person is only a judge once.

Great efforts are made to ensure that the judging panel is balanced in terms of gender and professions within the industry， so that a writer， a critic， an editor and an academic are chosen along with a well-known person from wider society. However， when the panel of judges has been finalized，they are left to make their own decisions without any further involvement or interference from the prize sponsor.

The Man Booker judges include critics， writers and academics to maintain the consistent quality of the prize and its influence is such that the winner will almostcertainly see the sales increase considerably， in addition to the ￡ 50，000 that comes with the prize.

The Man group________. 查看材料

Which of the following statements best explains the relationship between gold and its karat rating? 查看材料