2．When we are awake，________.

　　A．brain cells take in more proteins

　　B．litter of proteins build up in our brains

　　C．fluids in the brain continue flowing

　　D．our brains have more fluids flow

　　解析：选B。细节理解题。根据第五段中的“The longer someone stays awake，the more litter builds up.”可知，当我们醒着的时候，大脑分泌出来很多垃圾并且在大脑中堆积。

　　3．From what Houzel said，we know the space between brain cells________.

　　A．is in fact a kind of space

　　B．has ever been carefully studied

　　C．used to be regarded as unimportant

　　D．is where litter is stored in the end

　　解析：选C。推理判断题。结合倒数第二段中的“That space between brain cells is usually disregarded.It's considered just space”可知，原先人们对大脑中细胞之间的空隙没有给予太多的重视，认为仅仅是空间，因此选C。

　　4．What Nedergaard said in the last paragraph suggests that________.

　　A．we can't remember what we learned yesterday

　　B．it is very easy for us to forget the past things

　　C．the loss of memories may cause a person to die

　　D．we may die from lack of sleep rather than memories

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