Once mice fell asleep,fluids flowed into their brains.“It was almost like you opened a tap”,Nedergaard said.As the fluid passed through the spaces between brain cells,it washed away the litter.The tap slowed to a trickle(涓流) when mice woke up.
The scientists then looked closely at the brain cells.They found that the cells shrank during slumber(睡眠)—enough to open space through which the fluid can flow freely.When mice were awake,the cells swelled,lessening the fluid's flow.
The newfound house-cleaning activity occurs in a part of the brain that few people study,noted scientist Houzel.“That space between brain cells is usually disregarded.It's considered just space,”she said.
The new discovery also may help scientists solve an age-old mystery:Why do animals sleep?Every animal does it.Without it,they die,although no one knows why.Some studies suggest that the brain solidifies memories during sleep.However,Nedergaard notes,“You don't die from forgetting what you learned yesterday.”
1.According to the text,Maiken's discovery was________.
A.a real surprise B.a natural result
C.a big reward
D.a personal purpose
解析:选A。细节理解题。根据第四段中的“What the scientists hadn't expected...animals are awake.”可知,他们并没有想到会发现这个现象,因此这属于一个意外的发现,所以选A。
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