英语四级选词填空练习辅导

非学无以广才，非志无以成学。以下是小编为大家搜索整理的英语四级选词填空练习辅导，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!

So mang people use the cell phone so frequantly every day,But ___47__little is certain adout he health effects of its facturers___48___that cell phones meet government standards for safe radio- frequency radiation omission,but enough studies are beginning to document a possible ___49___in rare brain tumour(肿瘤)：bendaches and behavioral disorders in children to cause far,the avidence isn't___50___on whether the use of cell phones __51__to any uncased risk of a new

trial,researchers asked 47 yolunteers to ___52__in a project to measure glucose(葡萄糖)consurnption in the brain by scanning the brain to see how cells use both 50- minute scans,the volunteers had a cell phone __53__to each ng be first scan,the devices were turned off,but for the second scan,the phone on the right ear as___54____on and received a recorded- message call,although the yolume was muted(消毒)　　so the dise wouldn't bias the results of the second scan abowed that the__55__of the brain rarest to the device had higher rales of glucose consumption than the rest of the study ows that cell phones can change brain activity,and __56__a whole new avenue for scientific quiry,tuough it doesn't say anything about whether cell-phone radiation can cause cancer.

　　注意：此部分试题请在答题卡2上作答。

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