题目内容
13．This bag is a littleheavier（heavy） than that one．分析 这个袋子比那个重一点．
解答 答案：heavier．考查单词填空．句意"这个袋子比那个重一点．"．由than比．可知两者比较用比较级形式．heavy中的，比较级是heavier更重的，辅音字母+y结尾，改y为i，再加er．答案是heavier．
点评 单词填空类型题要充分理解句意，再根据单词提示完成试题，注意时态，单复数，词性等变化．
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（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．
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（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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