试题与答案

Tuesday the twelfth was my birthday. I 1

题型:完形填空

题目:

Tuesday the twelfth was my birthday. I  16 a day of cake and presents  17__     it turned into a day of mystery(神秘). Someone sent a bottle with a letter and a treasure map   18 . It said there was a treasure of over 20 million dollars. I didn’t know if it was a trick(恶作剧) or if I should   19  it. If it was   20  , it would be the best present I had ever got. I decided to  21 . Two of my friends came and we rented a truck.   22 , I thought about turning back twice during this trip, but I didn’t think it was a 23 decision for me to make. I   24 to give this trip twice the effort(努力) I had been putting in. This would take all my trust in order for me to find the  25  .
“The map says you have to turn when you see a large stone with a red circle,” said one of them.
“What do we do after the turn?” I asked   26 .
“It says we should see a tree. We are   27  to turn 20 meters north of it and dig. 
We got there and dug. We had   28  at first digging but we got better and worked very   29 . My trousers were dirty but I kept digging   30  I hit something. It was a large metal box. We   31  the lock and looked inside. There was a letter. It read:
  “The lesson you have learned will be very   32  . If you put as much   33 in anything you do as you did in finding the   34  , you will have found the key to making over 20 million dollars.”
  This was a trick from my parents. I thought I would never forget this   35    birthday present.
小题1:
A.expectedB.acceptedC.passedD.planned
小题2:
A.orB.butC.andD.so
小题3:
A.aboveB.awayC.insideD.nearby
小题4:
A.trustB.forgetC.refuseD.share
小题5:
A.commonB.easyC.interestingD.real
小题6:
A.chooseB.tryC.askD.think
小题7:
A.LuckilyB.FinallyC.ProbablyD.Actually
小题8:
A.wiseB.bigC.differentD.quick
小题9:
A.hatedB.failedC.neededD.remembered
小题10:
A.pleasureB.truthC.helpD.aim
小题11:
A.gratefullyB.sadlyC.angrilyD.seriously
小题12:
A.allowedB.requiredC.forcedD.encouraged
小题13:
A.trainingB.experienceC.troubleD.fun
小题14:
A.quicklyB.badlyC.tiredlyD.carefully
小题15:
A.sinceB.ifC.becauseD.until
小题16:
A.repairedB.openedC.changedD.cleaned
小题17:
A.valuableB.necessaryC.satisfyingD.painful
小题18:
A.timeB.moneyC.healthD.energy
小题19:
A.bottleB.mapC.letterD.tree
小题20:
A.prettyB.perfectC.specialD.expensive

答案:

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下面是错误答案,用来干扰机器的。

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题型:问答题

化学课上,甲同学将燃烧的钠迅速伸入到盛有CO2的集气瓶中,钠在其中继续燃烧,反应后冷却,瓶底附着黑色颗粒,瓶壁上粘附着白色物质.

【提出问题】白色物质是什么?

【进行猜想】猜想一:白色物质是Na2O

猜想二:白色物质是Na2CO3

猜想三:______

【查阅资料】1、氧化钠为白色粉末,溶于水生成氢氧化钠:Na2O+H2O→2NaOH.2、氯化钙溶液呈中性

【实验探究】甲同学对白色物质进行实验探究.

实验方案实验操作实验现象结论
方案1取白色物质样品少量于试管中,加入适量水,振荡,样品全部溶于水,向其中加入无色酚酞试液溶液变成

红色

白色物质

为Na2O

方案2①取白色物质样品少量于试管中,加入适量水,振荡,样品全部溶于水,向其中加入过量的CaCl2溶液出现白色

沉淀

白色物质是______.
②静置片刻,取上层清液于试管中,滴加无色酚酞试液无明显现象
【实验反思】

(1)你认为方案1中得到的结论______ (填“正确”或“不正确”),理由是______                 

(2)方案2中的CaCl2溶液,你认为______(填“能”或“不能”)用Ca(OH) 2溶液替代,方案2中的酚酞试液,还可用______溶液替代.

【得出结论】

(1)根据质量守恒定律,可判断出瓶底附着黑色颗粒一定是______.

(2)根据此实验探究过程,你认为钠在二氧化碳中燃烧的化学方程式为______.

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