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    【题目】In a recent study, some scientists looked at the monkey’s brain activity through a computer system, which changed the brain __________ into digital motor commands.

    A. sign B. signal C. assignment D. statistics

    【答案】B

    【解析】考查名词辨析。名词sign手势，符号，signal信号，暗号，assignment任务，工作，statistics统计。句意：在一项最新的研究中，一些科学家通过计算机系统观察猴子的脑部活动，这样可以把脑部信号转化成数字化的运动指令。根据句意可知B正确。

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