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  3. Is talking on a mobile phone hazardous t

Is talking on a mobile phone hazardous t

考试题库2022-08-02  79
问题 Is talking on a mobile phone hazardous to your health?It is difficult to know for sure.Some research suggests that heavy users of mobile phones are at a greater risk of developing brain tumors.However,many other studies suggest there are no links between cancer and mobile phone use.The main problem with the current research is that mobile phones have only been popular since the 1990s.As a result,it is impossible to study the long-term exposure of mobile phone use.This concerns many health professionals who point out that many cancers take at least ten years to develop.Another concern about these studies is that many have been funded by those who benefit financially from the mobile phone industry.Over three billion people use mobile phone on a daily basis,and many talk for more than an hour a day.Mobile phone antennas are similar to microwave ovens.While both rely on electromagnetic radiation,the radio waves in mobile phones are lower in radio frequency(RF).Microwave ovens have enough RF to cook food and are therefore known to be dangerous to human tissues.However,the concern is that the lower frequency radio waves that mobile phones rely on may also be dangerous.It seems logical that holding a heat source near your brain for a long period of time is a potential health hazard.Mobile phones get hot when they are phoned for a long period of time.Some researchers believe that over types of wireless technology may also be dangerous to human health,including laptops,cordless phones,and gaming consoles.Organizations that are concerned about the effects of Electromagnetic Radiation(EMR)suggest replacing all cordless devices with wired ones.They say that many cordless phones emit dangerous levels of EMR even when they are not in use.They even suggest keeping electronic devices,such as computers and alarm clocks out of bedrooms,or at least six feet from your pillow.Other wireless technology may also be hazardous to our health.A growing number of professionals worldwide are recommending that mobile phone users should use their phones carefully until more definitive studies can be conducted.They recommend that adults use headsets or speaker phones and that children and teens,whose brain tissues are still developing use mobile phones only for emergencies.Concerned medical experts use the example of tobacco to illustrate the potential risks.Many years ago,people smoked freely and were not concerned about the effects of cigarettes on their health.Today people know that cigarettes cause lung cancer,though it is still unknown exactly how or why.Some doctors fear that the same thing will happen with devices such as mobile phones.From Paragraph 3,we can learn that____________查看材料A.every day fewer than three billion people use mobile phonesB.mobile phone antennas are different from the microwave ovensC.comparing with microwave ovens,the radio waves in mobile phones are lower in radio?frequencyD.the lower frequency radio waves that mobile phones rely on are not dangerous
选项 A.every day fewer than three billion people use mobile phones
B.mobile phone antennas are different from the microwave ovens
C.comparing with microwave ovens,the radio waves in mobile phones are lower in radio?frequency
D.the lower frequency radio waves that mobile phones rely on are not dangerous
答案 C
解析 细节题。根据第三段中的“While both rely on electromagnetic radiation，the radio waves in mobile phones are lower in radio frequency（RF）”可知C项正确。根据第三段中的“0ver three billion people use mobile phone on a daily basis…”可知A项不正确；根据第j段中的“Mobile phone antennas are similar to microwave ovens”可知B项不正确；根据第三段中的“…the lower frequency radio waves that mobile phones rely on may also be dangerous”可知D项不正确。故本题选C。
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中学英语学科知识与教学能力

教师资格笔试

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