例3、下列说法正确的是：A、Cl2有毒，Cl-也有毒B、Cl和Cl-化学性质一样C、Cl2和Cl-都是黄绿色D、液氯并非氯水练习3.下列说法中正确的是（）A．用鼻子对着盛有氯气的瓶口，就可以嗅到氯气的气味B．用排水集气法便可以收集到纯净的氯气C．氯气有漂白性D．自来水常用氯气来杀菌、消毒解析：氯气是有毒气体，闻氯气的时候，应该用手轻轻地在瓶口扇动，使极少量的氯气飘进鼻孔。用排水法收集氯气会带有水蒸气，氯气本身没有漂白性。故选D。4.下列物质中，既含有氯分子，又含有氯离子的是（）A．氯化钠溶液B．新制氯水C．漂白粉D．液氯解析：氯水是一种多组分的混合物，新制的氯水中除了含有较多的水分子外，还含有Cl2、HClO分子及H＋、C1－、C1O－。四、典型例题导致下列现象的主要原因与排放SO2有关的是（）A．酸雨B．光化学烟雾C．臭氧空洞D．温室效应6．Whatabouthavingadrink?_____________A．Goodidea.B．Helpyourself.C．Goahead,pleaseD．Me,too.7．Idon'tthinkI'llneedanymoneybutI'llbringsome_________.A．atlastB．incaseC．onceagainD．intime8．_______totakethisadventurecoursewillcertainlylearnalotofusefulskills.A．BraveenoughstudentsB．EnoughbravestudentsC．StudentsbraveenoughD．Studentsenoughbrave9．Waiter!_____________Ican'teatthis,It'stoosalty.A．Yes,sir?B．What?C．Allright?D．Pardon?10．Mostanimalshavelittleconnectionwith________animalsof_________differentkindunlesstheykillthemforfood.A．the;aB．不填;aC．the;theD．不填;the11．It'salwaysdifficultbeinginaforeigncountry,___________ifyoudon'tspeakthelanguage.A．extremelyB．NaturallyC．basicallyD．especially12．LetHarryplaywithyourtoysaswell,Clare,youmustlearnto__________.A．supportB．careC．spareD．share13．You'veleftthelighton.Oh,soIhave.________andturnitoff.A．I'llgoB．I'vegoneC．IgoD．I'mgoing知识清单