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Modern science has found that _______ on...

Modern science has found that _______ one is using chopsticks, over 30 joints and over 50 muscles are used, which is a favorable stimulation to the brain.

A.since B.although C.unless D.while

 

D 【解析】 考查连词。句意:现代科学发现,当人在用筷子时,有30个关节和50块肌肉共同作用,这对于大脑来说是个有利的刺激。A. since因为;B. although虽然;C. unless除非;D. while当……时候。根据题意可知,while引导时间状语从句。故选D项。  
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