题目内容
17．Tony ____ his homework yet．（ ）| A． | haven't finished | B． | hasn't finished | ||
| C． | have finished | D． | has finished |
分析 托尼还没有完成作业．
解答 答案：B．根据题干中的yet应用于现在完成的否定句或疑问句中的用法可知，本句应用现在完成时的否定结构；又根据Tony是第三人称单数，应用has．故选B．
点评 本题考查现在完成时，做题时应注意题干中的关键词yet的用法，以及第三人称单数．
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（57）C They should know all the ways out of the house．If there is a fire，everyone follows the plan to get out．Part of the plan is to check all the windows to make sure they can be opened easily．Buy fire extinguishers （灭火器） in the house．Everyone in the family should know how to use them．
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*（60）A First，stop!Don't run!The fire burns faster because of more air．Drop!Fall to the floor．They roll!Turning over and over will make the fire go out．Put a blanket （毯子） around you to keep air away from the fire that may still be on you．
There are many possible causes for firs．A wise family is ready all the time．If there is a fire，don't forget to call 119for help．
（56）D Smoke from a fire causes the alarm to go off．The alarm makes a loud sound．The sound tells everyone to leave the house at once．
（57）C They should know all the ways out of the house．If there is a fire，everyone follows the plan to get out．Part of the plan is to check all the windows to make sure they can be opened easily．Buy fire extinguishers （灭火器） in the house．Everyone in the family should know how to use them．
（58）E Fire drills teach children about fire safety．Everyone in the family should know the following fire rules：
*（59）BThe fire can grow more quickly if you open the door．
*Stay close to the floor!Smoke can be more dangerous than fire； the best air is near the floor because smoke rises．
*（60）A First，stop!Don't run!The fire burns faster because of more air．Drop!Fall to the floor．They roll!Turning over and over will make the fire go out．Put a blanket （毯子） around you to keep air away from the fire that may still be on you．
There are many possible causes for firs．A wise family is ready all the time．If there is a fire，don't forget to call 119for help．
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It is very strange-it can take a great many people to go to different places at the same time．（72）C．To my surprise，it is free for everyone．
（73）D，and it can also take you to failure．It even can cause you death．
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