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1、英语四级选词填空试题及答案 So mang people use the cell phone so frequantly every day,But 47little is certain adout he health effects of its use.Macufacturers48that cell phones meet government standards for safe radio- frequency radiation omission,but enough studies are beginning to document a possible 49in rare
2、brain tumour(肿瘤)：bendaches and behavioral disorders in children to cause coneem.So far,the avidence isnt50on whether the use of cell phones 51to any uncased risk of cancer.In a new trial,researchers asked 47 yolunteers to 52in a project to measure glucose(葡萄糖)consurnption in the brain by scanning th
3、e brain to see how cells use energy.For both 50- minute scans,the volunteers had a cell phone 53to each ear.During be first scan,the devices were turned off,but for the second scan,the phone on the right ear as54on and received a recorded- message call,although the yolume was muted(消毒) so the dise w
4、ouldnt bias the results.The results of the second scan abowed that the55of the brain rarest to the device had higher rales of glucose consumption than the rest of the brain.The study ows that cell phones can change brain activity,and 56a whole new avenue for scientific quiry,tuough it doesnt say any
5、thing about whether cell-phone radiation can cause cancer. A)conclusive I)mission B)contributes J)participate C)derive K)particular D)expresses L)provides E)fixed M)regions F)immensely N)surprisingly G)increase O)switched H)maintain 47、F immensely 48、L provides 49、N surprisingly 50、D expresses 51、B contributes 52、J paticipate 53、E fixed 54、O switched 55、M regions 56、H maintain
