题目

【改编题】对于易燃、易爆、有毒的化学物质，往往会在其包装上贴上危险警告标签。下面所列物质，贴错了包装标签的是( ) 答案：【答案】C【解析】浓硫酸具有强烈腐蚀性，A项正确；汽油是易燃液体，B项正确；醋酸是食醋的主要成分，无毒，C项错误；氯酸钾是一种敏感度很高的炸响剂，属于爆炸品，D项正确。No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out． Today， however， we needn't worry about feeling pain during the operation． The sick person falls into a kind of sleep， and when he awakes， the operation is finished． But these happy conditions are fairly new． It is not many years since a man who had to have operation felt all its pain．Long ago， operation had usually to be done while the sick man could feel everything． The sick man had to be held down on a table by force while the doctors did their best for him． He could feel all the pain if his leg or arm was being cut off， and his fearful cries filled the room and the hearts of those who watched．Soon after 1770， Josept Priestley discovered a gas which is now called “laughing gas”．Laughing gas became known in America．Young men and women went to parties to try it． Most of them spent their time laughing，but one man at a party，Horace Wells，noticed that people didn't seem to feel pain when they were using this gas．He decided to make an experiment on himself．He asked a friend to help him．Wells took some of the gas，and his friend pulled out one of Well’s teeth．Wells felt no pain at all．As he didn't know enough about laughing gas， he gave a man less gas than he should have． The man cried out with pain when his tooth was being pulled out．Wells tried again，but this time he gave too much of the gas，and the man died．Wells never forgot this terrible event．1.It is ___________since a man being operated felt all the pain.A.a few more years B.not longC.few years D.two thousand years2.Long ago, when the sick man was operated on, he___________.A.could feel nothing B.could not want anythingC.could feel all the pain D.could do anything3.Using the laughing gas, the people did not seem to___________.A.be afraid of anything B.feel painC.want to go to the parties D.be ill4.If a man took less laughing gas than he should have when an operation went on he___________.A.felt nothing B.felt very comfortableC.still felt pain D.would die