13．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．signB．signalC．assignmentD．statistics

分析 在近來的一項研究中一些科學(xué)家通過電腦系統(tǒng)觀察了猴子的大腦活動，這一系統(tǒng)將腦信號轉(zhuǎn)化為數(shù)字神經(jīng)指令．

解答 答案：B
解析：A：標(biāo)志；B：信號；C：任務(wù)；分配；D：數(shù)據(jù)．根據(jù)句意"這一系統(tǒng)將腦信號轉(zhuǎn)化為數(shù)字神經(jīng)指令"可知本題答案為B選項"信號"，其余選項均不符合題意．拓展：人無法直接觀察到腦信號，因此只能將其轉(zhuǎn)化為可見的數(shù)字或圖象，再對其進(jìn)行分析．

點評 本題考查名詞的詞義辨析，做此類題目時一定要清楚各個選項的含義及其搭配用法，再根據(jù)句意確定最終的答案．

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