题目

很多物理现象跟气压的大小（通常说气压的高低）有关系，对人类的生活、健康有重要影响． 实验：（如图a）烧瓶中的水沸腾后移去酒精灯，水就停止沸腾；待水的温度降低一些后将大注射器接到烧瓶口上（如图b），向外拉注射器活塞，看到了什么现象？这个实验说明了什么问题？ 现象_________  ． 说明问题 _______． 换用其它液体，在各种气压下实验，表明一切液体的沸点，都是气压减小时降低，气压增大时增高． （1）研究问题的过程通常有下列 阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。 JACKSONVILLE,Fla,Nov．10．A 14-year-old boywas arrested today after the rotten body of an 8-year-old girlwho was his neighbor was found hidden in his bedroom．Shehad been stabbed and beaten． 　　The boy,Joshua Earl Patrick Philips,admitted and wascharged with murder in the death of the girl,Maddie Clifton,who disappeared on Nov．3,Sheriff Nat Glover said． 　　Joshua,who has no criminal record,would not be eligible（合格的）for the death punishment be cause his age．Detectires recovered a knife and a baseball bat believed to be theweapons used to kill the girl,the Sheriff said． 　　The girl had been stabbed at least nine times and wasstruck in the head,Sheriff Glover said at a news conference．The authorities did not say whether she has been attacked sex-ually,nor did they give motive for the attack． 　　The boy's mother,Melissa Philips,grew suspicious after the police searched her home on Monday and detected a smell,Sheriff said．This morning she pulled aside the frameof the bed,saw a child's feet and called an officer,he said． 　　Maddie's body was found under a sheet of wood supporting the frame of the water bed,which was filled,Sheriff Glover said,adding,“He put her under the bed and taped her up in it．” 　　Investigators believe the third-grader was killed in the boy's house shortly after she disappeared last Tuesday,touching off a widespread search． 　　On Friday．Maddie's parents,Steve and Sheila Clifton,made an earnest request for her return． 　　The boy's house．like others in the neighborhood,had been searched three times．During the third search on Monday,the mother had at first said she thought the odor came from family pets． 　　Hundreds of volunteers had distributed thousands of leaflets with Maddie's picture since she disappeared that evening,about 30 minutes after she went out to play with friends． 　　The girl's house is one of the well-kept,single-family homes in the older working-class of Jacksonville．Yellow rib bons（丝带）still hung from the trees this morning． (1) Which of the following statements is not fit for the report? [　　] A． After the girl disappeared,the police searched on a large scale． B． Quite a lot of people handed out lots of papers to look for the girl． C． The girl's parents are still waiting for their to come home safely on Friday morning． D． The police searched the boy's house and found the girl's body by a strange smell． (2) It can be inferred from the report that ________ [　　] A． the girl was killed in the boy's home B． the girl was stabbed many times and struck by a base ball bat C． it is the first time that the boy has been charged D． the boy won't be sentenced to death (3) The words“motive”probably means________ [　　] A． reason B． action C． motion D． information (4) The man,Sheriff Glover,may be________ [　　] A． a reporter B． a government official C． the girl's father D． a person in charge of the case