Scientists study ___________ human brains work to make computer.
A．whenB．howC．thatD．whether
B

試題分析：連詞辨析。A當…時；B如何；D是否；句意：為了生產(chǎn)計算機，科學(xué)家在研究人腦是如何工作的。故B正確。
考點:考查連詞辨析
點評：不同的連詞要放在上下文中進行辨析和理解，同時要注意同一個連詞的一詞多義現(xiàn)象。
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