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nbsp; B. Very useful.C. Very careful D. Very exciting
45. According to the passage, the writer _________.
A. was sorry for the poor school B. worked hard to teach the children
C. didn't want to work in the school D. left the school in a short time
解答:解:(1)加热高锰酸钾属于固体加热型,故选发生装置A;实验结束后,某同学发现水槽中的水变成了浅紫红色,可能是试管口未放棉花,导致高锰酸钾粉末进入导管,并进入水槽;过氧化氢分解制取氧气不需加热,可用B装置制取,双氧水在二氧化锰的催化作用下分解生成水和氧气,化学方程式为:2H2O2
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(2)实验室制取二氧化碳所用药品是大理石或石灰石和稀盐酸;若用F装置检验二氧化碳,应在其中装入适量的澄清石灰水,若石灰水变浑浊则证明是二氧化碳;
(3)能用E装置收集的原因是氢气难溶于水,且不与水反应;氢气的密度比空气小,故应从短导管进气;
故答案为:(1)A;试管口未放一团棉花;2H2O2
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(2)大理石(或石灰石);澄清石灰水;白色沉淀(或浑浊);
(3)氢气难溶于水,且不与水反应;b. (2013烟台)阅读理解
Once there was a huge apple tree. A little boy loved to come and play around it every day. He loved the tree and the tree loved to play with him.
Time went by --- the little boy had grown up and he no longer played around the tree every day. One day, the boy came back to the tree and he looked sad. “Come and play with me,” the tree asked the boy. “I’m no longer a kid. I wouldn’t play around the tree any more.” the boy replied. “I want toys. I need money to buy them.” “Sorry, I don’t have money. But you can pick all my apples and sell them. So, you will have money.” The boy picked all the apples on the tree and left happily. The boy never came back after he picked the apples.
One day, the boy returned and the tree was so excited, “Come and play with me,” the tree said. “I don’t have time to play. I have to work for my family. We need a house for shelter. Can you help?” “Sorry, I don’t have a house. But you can cut off my branches to build your house.” So the boy cut all the branches off the tree and left happily. The tree was glad to see him happy but the boy never came back since then. The tree was again lonely and sad.
One hot summer day, the boy returned and the tree was pleased. “Come and play with me!” the tree said. “I am sad and getting old. I want to go sailing to relax myself. Can you give me a boat?” “Use my trunk to build your boat. You can sail far away and be happy.” So the boy cut the tree trunk to make a boat. He went sailing and never showed up for a long time.
Finally, the boy returned after he left for so many years. “Sorry, my boy. But I don’t have anything for you any more. The only thing left is my dying root,” the tree said with tears ①
“Good! Old tree root is the best place to lean on and rest. Come and sit down with me and rest.” The boy sat down and the tree was glad and smiled with tears ② ----
51. ----Why did the boy pick all the apples on the tree?
----Because __________.
A. he wanted to eat them B. he needed money to buy toys
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C. he liked the tree without apples D. he wanted to share them with friends.
52. ----When did the boy come back to the apple tree?
----He came back _________.
A. whenever he was happy B. if he missed the apple tree
C. when he was in times of difficulty D. as soon as he was free
53. ----What did the boy want at last?
----He wanted ___________.
A. to have a house to live in B. nothing except a place to rest
C. the root of the apple tree D. anything that the apple tree had
54. ----What can we learn from the story?
----We should _________.
A. plant more apple trees B. learn from the boy C. always stay at home D. be thankful to our parents
55. According to the passage, which of the following statements is NOT true?
A. The phrase “with tears ①” means that the apple tree was sad because the boy asked for too much.
金莎娱乐 B. The phrase “with tears ②” means that the apple tree was still happy because she could help the boy
for the last time.
C. Each time the boy asked the apple tree for help, the tree tried her best to satisfy him.
D. After reading the passage, we can easily think of the old Chinese saying “Parents’ love is universal!”
(2013陕西)物理兴趣小组的同学利用图示装置,探究反射声音的强弱与充当反射面的材料是否有关.它们将发声的闹钟置于纸筒A内,将充当反射面的材料置于O处,通过纸筒B倾听反射的铃声强弱.
(1)保持纸筒A和纸筒B的位置____,只改变充当反射面的材料,让同一位同学倾听反射声音的强弱.实验结果如下表.
反射材料 | 大理石 | 玻璃板 | 木板 | 棉布 | 毛巾 | 海绵 |
反射声音的强弱 | 最强 | 强 | 强 | 较强 | 弱 | 几乎听不到 |
(2)实验结果表明,玻璃板和木板反射声音的强弱无法分辨,有同学认为可能是人耳对声音强弱的分辨能力不够造成的.对此,请你提出一个改进的措施或方法____(写出一条即可).
(3)如果利用声音的反射现象,测量声音在空气中的传播速度,应选择表中的____作为反射面效果最好. (2014十堰)8.综合性学习
某班准备开展以“厉行节约,反对浪费”为主题的综合实践活动,请根据要求,完成相关任务。
(1)下面是该班主题班会上主持人的开场白,请你根据上下文将其补充完整。
中华民族历来就有勤俭节约的传统。“谁知盘中餐,粒粒皆辛苦”!一粥一饭,当思来之不易;半丝半缕,恒念物力维艰。浪费是民族衰弱的祸端,节俭是 的良方 ;浪费是 的露水,节俭是长流不断的清泉……
(2)第二小组成员正在策划一项活动,甲同学建议办一期黑板报或一份手抄报,乙同学建议开展一次演讲比赛,丙同学建议在班上和校园里张贴宣传标语,丁同学策划的活动既新颖又有意义,得到大家一致赞同。请写出丁同学策划的活动名称及目的。
活动名称:
目的:
(2014株洲)26.(6分) 某同学利用“替代法”测量一粒花生米的密度,实验过程如图所示.
(1)在下列空格中填写适当内容.
①选择一粒饱满的花生米放入装有适量水的透明玻璃杯中,发现花生米下沉至杯底,如图(甲),此时花生米所受的浮力 小于 重力(填“大于”、“等于”或“小于”).
②往杯中逐渐加盐并搅拌,直至观察到花生米 悬浮 ,随即停止加盐,如图(乙).
③取出花生米,用调好的天平测杯子和盐水的总质量,如图(丙),天平的读数为 121 g.
④将玻璃杯中的盐水全部倒入量筒,如图(丁),量筒的读数为 55 mL.
⑤利用密度公式计算出盐水的密度,即为花生米的密度.
(2)实验中若加盐过量,可进行如下操作: 向盐水中加水 .
(3)实验中遗漏了重要的一步,即 将玻璃杯中的盐水全部倒入量筒,测出空杯子的质量 .
(2014白银市) [~&@*%]
25.一汉字书法是中华民族优秀传统文化之一,除了具有语言文字的实用价值之外,更具有艺术 欣赏价值。班级开展了“最美汉字书法”主题活动,请你一起参加。
(1)活动一:我会赏析
右面三幅作品各有特点,请你从选项 中选择最能体现其特点的一项,将其序号写在对应的括号中。(3分)
A.行笔潇洒飘逸,笔势委婉含蓄,如行云流水。唐太宗赞之日:“飘若浮云,矫若惊龙”。
被书法界誉为“天下第一行书”。
B.用笔方整,且能于方整中见险绝,字画的安排紧凑、匀称,间架开阔稳健。明代赵崡《石 [*^#~&]
墨镌华》称此碑为“正书第一”。
C.用笔放纵,笔势连绵环绕,字形奇变百出,不计一笔一字的工拙,力求气势畅达豪放,大起大落,放任不羁。
(2)活动二:我来介绍
请你选择可用材料,写一段文字,向班上同学介绍练习书法的方法。(限80字以内)
(3分)
材料一 临摹声两个意思,一是临,一是摹。临是看着帖上的字在另外的纸上临写,
摹是在范字上直接摹写,如描红。
材料二 东汉书法家张芝是甘肃酒泉人,有“草圣”之称。[来源:17教育网]
材料三 练习书法最好是临和摹结合起来,各扬其长。
材料四 甘肃成县的《西狭颂》被国务院列为全国重点保护文物。
材料五 临容易学到笔画,摹容易学到间架结构。 [~@%*^]
(3)活动三:我能表达
李明同学写不好汉字:同学劝他认真练习,可他却说:“现在电脑和智能手机已经很
发达了,都有汉字输入功能,以后就用不着用笔在纸上书写了,写不好没关系。”你要反驳
他,你说: 。(2分)
五、写作(60分)
(2014自贡)
23.(12分)阅读理解:
如图①,在四边形ABCD的边AB上任取一点E(点E不与A、B重合),分别连接ED、EC,可以把四边形ABCD分成三个三角形,如果其中有两个三角形相似,我们就把E叫做四边形ABCD的边AB上的“相似点”;如果这三个三角形都相似,我们就把E叫做四边形ABCD的边AB上的“强相似点”.解决问题:
(1)如图①,∠A=∠B=∠DEC=45°,试判断点E是否是四边形ABCD的边AB上的相似点,并说明理由;
(2)如图②,在矩形ABCD中,A、B、C、D四点均在正方形网格(网格中每个小正方形的边长为1)的格点(即每个小正方形的顶点)上,试在图②中画出矩形ABCD的边AB上的强相似点;
(3)如图③,将矩形ABCD沿CM折叠,使点D落在AB边上的点E处,若点E恰好是四边形ABCM的边AB上的一个强相似点,试探究AB与BC的数量关系.
(2015届黑龙江龙东地区中考)阅读《有才与用才》一文,回答后面题目。
有才与用才
①“时势造英雄,英雄亦能造时势”,但历史上能“造时势者”实属少数,更多的时候,我们读到的是一些比较哀怨的声音。左思有“冯公岂不伟,白首不见招”的慨叹,王勃有“冯唐易老,李广难逢”的感慨,苏轼更是以“持节云中,何日遣冯唐”自喻,他们借他人之酒杯,浇自己之块垒。翻开历史,如冯唐、李广身负雄才,却难遂志愿者,车载斗量,正如古人所言:“千里马常有,而伯乐不常有”。
②百里奚出游列国求仕,历经宋、齐不用,身为虞大夫而虞国亡,后来在秦国主政,却促进了秦国的崛起。百里奚在虞而虞亡,在秦而秦霸,何也?“非愚于虞而智于秦也,用与不用,听与不听也。”司马迁一席话道出其中奥妙,人才不仅在于发现,还在于使用,而用与不用又恰在于用人者之明与不明。倘若不量才而用,视宝玉为瓦砾,人才与庸才又有什么区别?
③当然,天下人才无数,而赏识者因时间、精力乃至视野所限,并非能识遍所有人才。因此,生逢其时的有才之士,不应去学姜太公钓于隐溪,而应有勇气展露才华,甚至毛遂自荐。
④韩信有大将之才,跟随项梁无所知名,后跟随项羽,积极进言献策,亦不被采用,官职仅为郎中。后来跟随汉王,多次主动与萧何交谈,始有“萧何月下追韩信”的美谈,并获得萧何力荐。默默无闻的韩信能担任大将军之职,虽离不开萧何知人的才略、离不开汉王善任的胆识,但更离不开毛遂自荐的自信和审时度势的智慧。倘若韩信一意消沉,自己不努力争取,今天世上怕就没有几个人知道还有韩信这个将才了。
⑤以上几人,百里奚、韩信终能施展才华,冯唐、李广却只有怀才不遇、壮志难酬的慨叹。同样是生逢其时,却有着完全不同的人生遭遇。
⑥我们身处一个机遇与挑战并存的时代,我们身边也不缺乏各种各样优秀的人才。要想致力于国家的建设,实现人生的理想抱负,不仅需要有