The toothbrush will also be able to talk to other applications on your phone, so developers could, for instance, create a game controlled by your toothbrush. You could score points for beating monsters among your teeth. “We try to make it smart but also fun，” Serval says.

　　Serval says he was inspired by his experience as a father. He would come home from work and ask his kids if they had brushed their teeth. They said “yes”， but Serval would find their toothbrush heads dry. He decided he needed a brush that really told him how well his children brushed.

　　The company says the Kolibree will go on sale this summer, for $99 to $199, developing on features. The US is the first target market.

　　Serval says that one day, it'll be possible to replace the brush on the handle with a brushing unit that also has a camera. The camera can even examine holes in your teeth while you brush.

　　56．Which is one of the features of the Kolibree toothbrush?

　　A．It can sense how users brush their teeth.

　　B．It can track users' school performance.

　　C．It can detect users' fear of seeing a dentist.

　　D．It can help users find their phones.

　　57．What can we learn from Serval's words in Paragraph 3?

　　A．You will find it enjoyable to see a dentist.

　　B．You should see your dentist on a day­to­day basis.

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