【題目】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】

試題分析：考查連詞。A. since因為；B. although雖然；C. unless除非；D. while當。。時候 ；句意：現(xiàn)代科學發(fā)現(xiàn)，當人在用筷子時，有30個關節(jié)和50塊肌肉共同作用，這對于大腦來說是個有利的刺激。根據(jù)題意可知選D項。

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