makes people inhale(吸气)less, reducing the size of the inhale. But。scent of fresh bread causes

　　a long, deep inhale.、rzi and her team took advantage of this reaction for their experiment.

　　As people slept in the laboratory, the researchers delivered pleasant scent, such as shampoo.

　　As this nice smell got into the sleepers' noses, the researchers played a particular music. Later, a

　　disgusting smell, such as rotten fish or meat, was paired with a different music. Neither the smell

　　nor the sound woke people up. After just four exposures to the smell-music pair during a single

　　night, the sleepers started to automatically respond to the tones without the accompanying smells,

　　taking in bigger breaths when the shampoo-associated tone played and smaller breaths when played

　　the sound linked to the rotten fish smell.

　　This new learned association lingered into the next waking day, too. Even though the sleepers

　　had no idea they had been exposed to smells or sounds, their behavior proved that their brain had

　　actually learned something during sleep. As before, the shampoo sound stimulated a long, deep

　　inhale, while the rotten fish tone caused more shallow breaths.

　　43. We can infer from the passage that

　　A. while sleeping, we can learn whatever we want to learn

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