求英语作文,题目是手机是否在课堂上允许?300字单词,给我好回答,给优评!

求英语作文,题目是手机是否在课堂上允许?300字单词,给我好回答,给优评!

why cell phones arebad
The consequences of cell phone use
Cell phones are a source of electromagnetic fields,radiation which createschange in anything it comes into contact with.EMFs emanate from mobile phonesand because of how phones are used,these EMFs come into direct contact withthe brain.
More than a dozen studies have linked using a cell phone for a long period oftime -- ten years or more -- with a higher incidence of brain tumors andacoustic neuromas.These critical diagnoses are even more common when phonesaren't switched from one side of the head to the other when engaged inconversation.
Other adverse health effects include:
• Evidence of leukemia,breast cancer and other cancers.
• Neurological concerns and changes in the nervous system.
• A much higher risk of salivary gland tumors.
Supporting studies
A study from the Medical University of Graz in Austria showed that cell phoneuse negatively affects sperm quality in men.A similar study from 2009 examinedmen in the height of their reproductive years and found infertility and theability to father a healthy baby were compromised by cell phone usage.
Cells phones are also a source of perfluorooctanoic acid,a harmful chemicalwhich has been linked to heart disease,cancer and femalereproductive/developmental damage.
Cell phones are not the only problem.Cell phone towers,as well as otherwireless devices,are responsible for contributing non-ionizing radiofrequencies into the environment.Both the World Health Organization and theInternational Association for Research on Cancer have classified theelectromagnetic fields emitted by cell phones as a 2B,possible carcinogen.Thetowers and the phones themselves are constantly emitting microwave radiation.Even when cell phones are not in use they are putting out EMFs.