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    An experiment was done on macaques（猕猴）.They1.(give)a chain and taught that they would be fed if they pulled2.chain.The catch,however,was that every time they pulled the chain,another macaque would be shocked.

    Even though it meant risking starvation,87% of the macaques refused3.(pull) the chain if they knew it would hurt another macaque.In one case,a macaque went a full two weeks without eating rather than deal with the guilt of4.(hurt) another animal.

    It's pretty impressive when you compare that to another study because another group of5.(science) did a similar experiment on a different animal-humans.They paid people to pull a lever（杠杆）6.they said would shock another person with7.(electric).That other person was an actor who pretended to be8.great pain every time they pulled the lever.In the experiment,a full 87% of the people pulled the lever all the way to a space9.(mark) "Danger!Severe Shock!"even while hearing their victim scream painfully.It was all to get a few dollars that they could have10.(easy) earned by getting a job at McDonald's.

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