六.填空 Do you know that humans have been cleaningtheir teeth for over 7,000 years? According to the BBC, the Ancient Egyptiansused a type of toothpaste ( 牙膏 ). ___1____ it is believed that theEgyptians used a finger ____2____ a toothbrush to clean their teeth .Chinesepeople may have ____3____ the first toothbrush around 1,600 BC. Your toothbrush, however, may have also become____4___ .Because it isnow possible to clean our teeth ___5___ using our hands! Two Canadians, Adel Elseri and Said Fayad,have invented___6____ called T2T or "tongue-to-teeth" Elseri says he came up with theidea___7____ he was driving home after a long day at work His___8___ is atoothbrush that goes onto your tongue( 舌 ) T2T hasspecial edges and toothpaste .So just___9____your tongue over your teeth and it cleans your teeth just like atoothbrush ___10___! It will make your breath fresh too Elseri and Fayad made this hand-freetoothbrush because they believed it was a __11___way for someone to brush theirteeth. But people can only use the T2T ___12____. Would you use the tongue-to-teeth? TheHuffington Post in the US ___13____ readers what they thought. Sixty-onepercent said that they would use it while only thirty-nine percent said they___14____. Personally I think I'm goingto stick to the ___15____. 1. A. So B. Then C. But D. Or 2. A. instead of B .because of C .more than D .less than 3. A .discovered B. develop C .built D. developed 4. A. science B. history C. problem D secret 5. A by B. from C. without D for 6. A .nothing B. everything C. anything D .something 7. A. until B. when C. since D .though 8. A .idea B. story C. word D plan 9. A. hold B. pull C. move D. check 10. A is B. does C. was D. did 11. A healthier B. easier C. harder D. longer 12. A. again B. soon C once D already 13. A. told B. asked C. warned D. advised 14. A. shouldn't B .should C. wouldn't D. would 15. A finger B toothbrush C. mouth D tongue