课时提升作业(六) 必修1 Module 6.docVIP

温馨提示： 此套题为Word版，请按住Ctrl,滑动鼠标滚轴，调节合适的观看比例，答案解析附后。关闭Word文档返回原板块。 课时提升作业(六) 必修1　Module 6 Ⅰ. 阅读理解 A 　　Holding a cellphone against your ear or storing it in your pocket may be dangerous to your health. This explains a warning that cellphone manufacturers include in the small print that is often ignored when a new phone is purchased. Apple, for example, doesn’t want iPhones to come closer to you than 1. 5 centimeters; Research In Motion, BlackBerry’s manufacturer, recommends 2. 5 centimeters. If health issues arise from cellphone use, the possible effects are huge. Voice calls－Americans chat on cellphones 2. 26 trillion(万亿)minutes annually earn $109 billion for the wireless carriers. Devra Davis, an expert who has worked for the University of Pittsburgh, has published a book about cellphone radiation, “Disconnect”. The book surveys scientific research and concludes the question is not settled. Brain cancer is a concern that Ms. Davis examines. Over all, there has not been an increase in its incidence since cellphones arrived. But the average masks an increase in brain cancer in the 20-to-29 age group and a drop for the older population. “Most cancers have multiple causes, ”she says, but she points to laboratory research that suggests low-energy radiation could damage cellphones that could possibly lead to cancer. Children are more vulnerable(易受伤的)to radiation than adults, Ms. Davis and other scientists point out. “Radiation that penetrates only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains contain more absorptive fluid(易吸收的液体). No studies have yet been completed on cellphone radiation and children, ”she says. Henry Lai, a research professor in the bioengineering department at the University of Washington, began laboratory radiation studies in 1980 and found that rats exposed to radiation had damaged DNA in their brains. Ms. Davis recommends using wired head