英语习一一．1.wolves2."beginning3."wears4."least5."tasty6."nowhere7."pleasant8."Climbing9."crazy10."without二．1.D2."B3."A4."B5."B6."B7."A8."D9."A10."A11."B 12."A三．1.with2."from3."in4."at5."of6."for7."in、for8."in9."with10."by四．1.practicing2."were3."will die4."didn’t watch5."smoking6."are getting7."lost8."keep9."lying10."to watch五．1.Don’t open when driving2.won’t camping it rains3.leave five-year-old on own4.The ninth the same as5.make noise to do六．1.C2."B3."A4."A5."A6."C7."D8."DA10."D练习二一．1.Leaves2."activities3."ninth4."worried5."beauty6."useful7."amazing8."less9."better10."weight二．1.have less than2.is helpful to3.spend better results on4.as interesting as5.Luckily put out6.took a trip famous1.AHow far2.BAre3.Bnot talk4.B/5.Bso much6.Bdoesn’t like7.Bto answer8.Bwill be9.Bisn’t1 0."Don四．1.C2."B3."C4."B五．1.policeman2."E-dog3."frog1.more helpful than2.Did enjoy themselves3.keeping secret between4.the same as5.less time by coach6.isn’t on is it练习三一．1.quietly2."fit3."popular4."finishes5."twelfth6."word7."twice8."lost9."medals10."save二．1.C3."D4."A5."B6."B7."C8."B9."B10."B三．1.as the as mine2.different from3.Be careful with hurt4.Make sure closed5.hurt stay in hospital6.lost their lives7.should in danger8.is getting smaller smaller 四．1.herself2."theirs3."me4."themselves5."them6."yourself7."us8."Its9."Our10."his五．best fit exercise learn alone took beautiful dangerous choose makes 六．1.D2."B3."A4."D5."D练习四一．1.feeding2."feathers3."close4."readers5."bored6."languages7."report8."themselves9."smell10."organizing二．1.in2."about3."on4."from5."as6."of7."of8."on9."for10."in三．1.the most popular2.telling so much funny3.saved out of ago4.has problems5.much pay for6.good at telling so happy7.protect won’t survive8.live up to四．1.finish2."to speak3."brushes4."is5."is flying6."is having7."watching8."will reach9."stops10."to chat五．1.B2."A3."A4."B5."C6."D7."A8."D9."B10."C六．exciting famous the-most-popular interesting cleaner more-beautiful the-nicest more练习五一．1.interest2."hunters3."keep4."farmlands5."hungry6."solve7."ourselves8."Wednesday9."less10."teeth二．1.playing2."worrise3."is blowing4."is trying5."happened6."will watch7."Keep8."to feed9."is washing10."looks 三．1.B2."B3."B4."A5."B6."B7."A8."C9."D10."A11."B12.".B四．1.B2."C3."C4."D5."D6."A7."C8."B9."A10."C五．1.Youth Award.2.He is very helpful.3.Yes,he is.4.He quickly jumped into the water and did his best to save the boy.5.Zhang Li.练习六一．1.thinner2."closed3."heroes4."advertisements5."actions6."bamboos7."living8."smlilng9."most busy10."weight二．1.less than2.taught himself3.as as4. What about5.belongs to6.Are able to7.shorter than8.is favourite9.on foot10."by himself三．1.on2."on of3."out of4."at5."in6."in7."on8."around in9."through10."at四．smoke away knocked called through could helped arrived out thanked 五．1.stopped2."did find found3."got4."died5."were was6."will be7."felt8."is waiting9."go10."will meet 六．1.D2."C3."A4."C5."B练习七一．1.C2."A3."B4."A5."C6."C7."A8."C9."A10."D二．1.B2."C3."B4."D5."A练习一物理1.树叶空气柱2固体振动3固体能够传声4响度音调5音色频率6真空不能够传声7不能间隔时间太短8响度音色音调音色音调响度9人耳声源10（1）是是（2）乙丙甲11机械闹钟B12固体传声比气体传声效果好13振幅大，响度大d从声源处减弱噪声21（1）甲（2）0."29秒22（1）在传播过程中衰减较少……几百米甚至几万米（2）对建筑物有很大的破坏性练习二1凝固放热2不能温度超过熔点钨3能铅熔点比锡低4冰冰融化吸热5重水蒸气液化放热6融化吸热，凝固放热7液化凝华8沸腾汽化吸热9叶蒸发吸热10雪融化吸热11水蒸气液化12气酒精13."20温度随时间下降的越来越慢22A去两只相同的大烧杯，分别盛有等量的酒精和水，把两杯都放在阴凉处，一段时间后观察比较两杯中液体的多少23不一样，因为水蒸发吸热，包着湿布的温度较低含水分较多，则减少湿布水分蒸发，两温度计示数相近含水分少，则增加湿布水分蒸发，两温度计示数相差较大练习三1。