What does that mean in terms of your phone? We can assume that people like to notice when their phone is ringing, and that most people hate missing a call. This means their perceptual systems have adjusted their bias(偏向)to a level that makes misses unlikely. The unavoidable cost is a raised likelihood of false alarms of phantom phone vibrations.

　　The trade­off between false alarms and misses also explains why we all have to put up with fire alarms going off when there isn't a fire. It isn't that the alarms are badly designed, but rather that they are very sensible to smoke and heat and biased to avoid missing a real fire at all costs. The outcome is a rise in the number of false alarms. These are inconvenient, but nowhere near as inconvenient as burning to death in your bed or office.The_alarms_are_designed_to_err_on_the_side_of_caution.

　　1．The writer tries to explain phantom phone vibrations ________.

　　A．by analyzing some facts

　　B．by giving some examples

　　C．from the angle of biology

　　D．from the angle of psychology

　　2．According to the writer, the sense of phantom phone vibration is ________.

　　A．strange and mad

　　B．harmful but avoidable

　　C．common and unavoidable

　　D．universal but unhealthy

　　3．When we judge correctly that “it's not ringing”，this is called a “________”．

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