18．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（跟踪） 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． The toothbrush will be able to teach you to brush right （don't forget the insides of the teeth!） and make sure you're brushing long enough．"It's kind of like having a dentist actually watch your brushing on a day-to-day basis，"says Thomas Serval，the French inventor． The toothbrush will also be able to talk to other applications on your phone，so developers could，for example，create a game controlled by your toothbrush．You could score points for beating monsters among your teeth．"We try to make it smart and 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，from 99to199，and the U．S．is the first target market． 29．All of the following statements are wrong exceptB． A．It can track users'school performance． B．It can sense how users brush their teeth． C．It can check users'fear of seeing a dentist． D．It can help users find their phones． 30．What can we learn from Serval's words in Paragraph 3？D A．You will find it enjoyable to see a dentist． B．You should see your dentist on a day-to-day basis． C．You'd like a dentist to watch you brush your teeth every day． D．You can brush with the Kolibree as if guided by a dentist． 31．What can we infer about Serval's children？A A．They were unwilling to brush their teeth B．They often failed to clean their toothbrushes． C．They preferred to use a toothbrush with a dry head． D．They liked brushing their teeth after Serval came home．
2．A dog named Ace is being praised as a hero for licking （舔） the face of a sleeping，deaf 13-year-old Indianapolis boy to warn him that the house was on fire．Indianapolis Fire Department Officer Rita Reith said Nick Lamb was home alone and sleeping without his hearing aids （助听器） when the fire began Wednesday． "My dog licked my face and woke me up，"Lamb said．"I was like，‘Stop it!What？You want to be fed？'I thought he wanted to be fed or go outside．"The dog didn't stop licking Lamb until the teen got up．That's when he realized the house was full of smoke．"I couldn't hear anything because I had my hearing aids off．My dog Ace smelled it，"Lamb said．"I just wanted to get out．"Without his shoes but with Ace by his side，he covered his nose and mouth with his T-shirt，and rushed out of the back door，catching one of his hearing aids along the way．He then called his mother and 911． Lindsay Bernard，Lamb's mother，praised Ace for saving her son's life．"It's amazing，because if Ace hadn't been there，Lamb prob ably wouldn't have even woken up，"Bernard said． Lamb，who was born deaf，told firemen that this was the first summer he was old enough to stay home alone and that he had returned from summer camp just three days earlier． 21．According to Paragraph 1，Nick LambD． A．lives alone B．is a healthy boy C．was bitten by his dog D．didn't know there was a fire 22．How did Nick Lamb survive the fire？C A．Using his hearing aids． B．With the help of firemen． C．Under the guidance of Ace． D．With the help of Lindsay Bernard． 23．Which of the following words can best describe Ace？C A．Polite．B．Careful．C．Clever．D．Proud． 24．What was Lindsay Bernard's attitude towards the dog？D A．Surprised．B．Worried．C．Hopeful．D．Thankful．
