C.Aristotle’s natural science most influence scientific thought for two thousand years.

　　D.Thales first guessed the electrification of amber.

　　D

　　Between now (June) and Labour Day, millions of Americans will offer up their bodies to the sun’s rays. A an indicates health and beauty, and most sun worshippers will sacrifice ( 牺牲 ) lot to achieve it including themselves. With each hour, the sun’s ultraviolet (紫外线 ) radiation produces irreversible ( 不可逆的) damage, hastening the development of unsightly wrinkles. And with each year on the beach or rooftop, the sunbather increases his risk of getting skin cancer.

　　Skin cancer is by far the most common form of cancer. An estimated 400,000 new cases will be detected this year in the US, and almost all of them can be blamed on overexposure to the sun. Fortunately, most of these cancers are highly curable. But they can be disfiguring and take time to treat. For that reason, sun worshippers should treat deity with a good deal of awe.

　　Sunburn, of course, is the initial danger posed by UV radiation. Prolonged exposure to UV, however, interferes with the production of collagen fibres in the dermis, causing the skin to lose elasticity and creating premature wrinkles. Further damage of the dermis deprives the epidermis of nutrition and causes it to become thin and dry.

　　Cancer is UV’s final insult. Short-wave radiant energy, especially from the UV-B band, breaks the strands of DNA. Enzymes works constantly to rearrange the DNA into proper sequence, but with repeated UV exposure,

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