All the 6,000 medals for the 2008 Olympic Games have arrived in the capital from the Shanhai Mint,ready for their debut(首次登場)on August 8.For the,first time in Olympic history,the medals for the Beijing Games mix metal and jade.

The technology of inlaying jade into metal can date back to the Han Dynasty almost 2,000 years ago.It is not easy to bond jade perfectly with metal.The key to the process lies in the inner layer of the metal and the groove(凹槽)of the jade ring.A seal ring is put between the inner layer and the groove to join the metal and jade together.

Jade rings used for casting Olympic medals have been subjected to strict quality controls,and those not up to the standard have been thrown away.

To make use of those jade rings that do meet the quality criteria,metal medals were produced to fit the jade tings,and more than ten different sizes of seal rings were designed.

To avoiding any loosening of the jade rings due to aging of the seals,glue has been used in casting the;Olympic medals,which is a painstaking manual process.

Experts from the International Olympic Committee(IOC)were concerned about the risk of fragility(脆弱)when the jade ring design was proposed.The IOC required that jade rings should be strong enough to withstand a 2-meter drop test.The Shanghai Mint raised that standard to 3- meters.Medals call survive a 3-meter drop test with only minor cracks on the jade rings.

 

46.The medals for 2008 Olympic Games are different from those of the past games in which they______.   

    A.a(chǎn)re made of pure gold    B.a(chǎn)re more valuable

    C.mix metal and jade        D.a(chǎn)re made in different cities

47.The second paragraph tells us___________________.

    A.the history of China’s jade products

    B.the technology of inlaying jade into metal

    C.the outlook of the medals

    D.why Shanghai Mint was chosen to make the medals

48.What the International Olympic Committee(IOC)were concerned about is that______.

    A.the medals will be worth less

    B.the medals are too difficult to make

    C.competitors don’t like the design

    D.jade is fragile and easy to break up

49.Which of the following is TRUE according to the passage?

    A.The medals for 2008 Olympic Games are the first of this kind in history

    B.The medals for the 2008 Olympic Games must be more valuable than those for other Olympic Games.

    C.It was quite a few years ago that Shanghai Mint began to produce medals for the 2008 Olympic Games can compare with any medals for other Olympic Games.

    D.The size and weight of the medals for 2008 Olympic Games call compare with any medals for other Olympic Games.

50.We can infer from the passage that______________.

    A.China produces more jade than any other country in the world

    B.the organizers of 2008 Olympic Games want to save some rare medals

    C.the medals mixing metal and jade prove to be of high quality through destructive experiments

    D.the medals will be damaged when dropped from a height of two meters

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