— What did you do last night, Bob?

— First I did my homework, and then I played ______ piano for half ______ hour.

A．the；a B．/；an

C．the；an D．a(chǎn)；the

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How fit are your teeth? Are you lazy about brushing them? Never fear: An inventor is on the case. An electric toothbrush senses how long and how well you brush, and it lets you track(監(jiān)測) your performance on your phone.

The Kolibree toothbrush was exhibited at the International Consumer Electronics Show in Las Vegas this week. It senses how it is moved and can send the information to an Android phone or iPhone via a Bluetooth wireless connection.

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

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The company says the Kolibree will go on sale this summer, from $99 to $199, depending on features.

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Kolibree toothbrush

1.

Thomas Serval

Features

It’s an electric toothbrush that senses 2. you brush teeth and it 3. information to the mobile phone.

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Ideas for the

invention

Serval’s children didn’t 7. to brush teeth and often lied to him, so he made a 8. to invent a brush that can tell him how well they brushed.

Price

It 9. $99--$199 each.

Future development

It will be possible to check your teeth by placing a brushing unit10. a camera.

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