_____ to sunlight for too much time will do harm to one’s skin.

　 A. Exposed 　     B. having exposed

　 C. Being exposed 　 D. After being exposed

C


解析:

 動名詞短語做主語，用系表結(jié)構(gòu)表示狀態(tài)。

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科目：高中英語 來源： 題型：閱讀理解

Passage Eleven (Superconducting Materials)

The stone age, The Iron Age. Entire epochs have been named for materials. So what to call the decades ahead? The choice will be tough. Welcome to the age of superstuff. Material science -- once the least sexy technology – is bursting with new, practical discoveries led by superconducting ceramics that may revolutionize electronics. But superconductors are just part of the picture: from house and cars to cook pots and artificial teeth, the world will someday be made of different stuff. Exotic plastics, glass and ceramics will shape the future just as surely as have genetic engineering and computer science.

The key to the new materials is researchers’ increasing ability to manipulate substances at the molecular level. Ceramics, for example, have long been limited by their brittleness. But by minimizing the microscopic imperfections that cause it, scientists are making far stronger ceramics that still retain such qualities as hardness and heat resistance. Ford Motor Co. now uses ceramic tools to cut steel. A firm called Kyocera has created a line of ceramic scissors and knives that stay sharp for years and never rust or corrode.

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But new materials have no impact until they are made into products. And that transition could prove difficult, for switching requires lengthy research and investment. It can be said a firmer handle on how to move to commercialization will determine the success or failure of a country in the near future.

1.How many new materials are mentioned in this passage?

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科目：高中英語 來源： 題型：

_____ to sunlight for too much time will do harm to one's skin. 

A. Exposed  B. Having exposed  C. Being exposed  D. After being exposed

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科目：高中英語 來源： 題型：閱讀理解

A healthy dose of sunshine may be the secret to staying young, British scientists have disclosed.

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The study suggests vitamin D may help to slow down the ageing process of DNA, and therefore the ageing process as a whole.

Lead researcher Dr Brent Richards said: "These results are exciting because they prove for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D．

"This could help to explain how vitamin D has a protective effect on many ageing related diseases, such as heart disease and cancer."

He said further studies are required to confirm the findings.

Professor Tim Spector, head of KCL's twin research unit, and a co-author of the report, added: "Although it might sound absurd(荒謬的), it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process."

Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the body's supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.

Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease.

64．What’s the best title of this passage?

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科目：高中英語 來源：2013-2014學(xué)年陜西省西安市高三下學(xué)期第二次模擬考試英語試卷（解析版） 題型：單項填空

??? to sunlight for too much time will do harm to your skin.

A.Exposed ????? B.Having exposed

C.Being exposed???? D.After being exposed

 

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