Eyes are known to be a powerful perceptual(知觉的)signal for humans，scientists say.

　　“Even though the eyes were not real，they still seemed to make people behave more honestly，”said Melissa Bateson，a behavioral biologist and leader of the study.

　　Researchers believe the effect throws light on our evolutionary past.It may arise from behavioral characteristics that developed when early humans formed social groups to strengthen their chances of survival.For social groups to work，individuals had to co­operate，rather than act selfishly.“There's an argument that if nobody is watching us，it is in our interests to behave selfishly.But when we're being watched we should behave better.So people see us as co­operative and behave the same way towards us，”Bateson said.

　　The new finding indicates that people have a striking response to eyes.That might be because eyes and faces send a strong biological signal we have evolved to respond to，Bateson said.

　　The finding could be put to practical use.For example，images of eyes could ensure ticket sales on public transport and improve surveillance(监视)systems to deter antisocial(反社会)behavior.

　　1．The story is written mainly to ________.

　　A．warn you to behave honestly whether you are alone or not

　　B．explain the root of cheating in exams with no teachers present

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