2018年12月英语六级听力音频-2018年12月英语六级听力常考时文：SunscreensMayLeaveSkin...

【#四六级考试# 导语】英语听力是英语四六级考试中的重要组成部分，对于中国的考生，日常英文听说机会少，缺少听力训练，所以在备考大学英语四六级时，需要加强听力的训练。针对这一情况，®文档大全网英语四六级频道特别整理听力相关文章《2018年12月英语六级听力常考时文：Sunscreens May Leave Skin...》，供学员参考使用。预祝大家高分通过考试。

　　2018年12月大学英语六级听力常考时文盘点

　　英语六级听力常考时文：Sunscreens May Leave Skin Vulnerable to UV

　　1.What can molecules in sunscreens do to the skin over time? They can ... the skin.

　　2.What is the correct way to use a sunscreen? To ... on the skin.

　　3.How often is it recommended to use sunscreens? Every ...

　　Unless sun lovers continually reapply sunscreen, agents in the sunscreen itself can attack the skin and leave the body susceptible to ultraviolet radiation, researchers say. Scientists at the University of California at Riverside have found that molecules that block UV radiation in sunscreen can, over time, penetrate into the skin, leaving the outer body vulnerable.Kerry Hanson, a research scientist in the Department of Chemistry at UCR, said that sunscreens do an excellent job protecting against sunburn when used correctly.This means using a sunscreen with a high sun protection factor and applying it uniformly on the skin. However, Hanson pointed out that their data showed that if coverage at the skin surface was low, the UV filters in sunscreens that had penetrated into the epidermis could potentially do more harm than good. Unprotected skin exposed to UV radiation generates harmful compounds called reactive oxygen species or ROS. These molecules can react with cells, membranes and DNA, causing skin damage and signs of aging. Hanson's research team found that three UV filters widely used in sunscreens generate ROS when skin is exposed to UV radiation. Only a few UV-filters are capable of blocking UV-A, the wavelengths that penetrate deeply into the skin. "For now, the best advice is to use sunscreens and reapply them often — the Skin Cancer Foundation recommends every two hours, and especially after sweating or swimming, which can wash away sunscreen — to reduce the amount of UV radiation from getting through to filters that have penetrated the skin. This, in turn, would reduce ROS generation." said Christopher Bardeen, an assistant professor of chemistry at UCR.

　　2018年12月大学英语六级听力常考时文盘点

2018年12月英语六级听力常考时文：Sunscreens May Leave Skin....doc

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