B卷

　　Ⅰ.阅读理解

　　A

　　(2015·郑州第三次质量预测)Do you ever pull your phone out of your pocket，thinking it is vibrating(振动)，only to find that it isn't?

　　This phenomenon，which scientists call “phantom(幻觉的)phone vibration”，is very common.Around 80% of people surveyed say they have imagined their phones vibrating when they were actually still.

　　So，what leads to this universal behavior? According to the BBC，the explanation lies in your brain's ability to discover signals from the outside world.

　　When your phone is in your pocket，there are two possible states：it is either vibrating or not.Meanwhile，you also have two possible states of mind：the judgment that the phone is vibrating，or that it isn't.

　　Ideally，you match the four states correctly.However，sometimes your brain decides that the consequences of missing a call are more serious than a “false alarm”．Therefore，you become more sensitive to vibrations so that you don't miss anything.

　　This is just like the fire alarm in your home—it can be annoying when it goes off in response to just a tiny bit of smoke.But that's a small price to pay compared to a fire really breaking out because the alarm fails to alert you.

　　Now，you might still ask：why can't our brains just make every judgment correctly without being too sensitive to false signals?

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