[题目]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 题目和参考答案——青夏教育精英家教网—

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【题目】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

【答案】D

【解析】

试题分析：考查连词。A. since因为；B. although虽然；C. unless除非；D. while当。。时候；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。根据题意可知选D项。

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