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玉林市中考试题

时间:2017-03-28 来源:东星资源网 本文已影响 手机版

篇一:2015年广西玉林市中考数学试卷解析

s="txt">一.选择题(每小题3分,共36分,每小题给出的四个选项中只有一个是正确的)

1.(3分)(2015?玉林)的相反数是( )

22

5.(3分)(2015?玉林)如图是由七个棱长为1的正方体组成的一个几何体,其俯视图的面积是(

6.(3分)(2015?玉林)如图,在△ABC中,AB=AC,DE∥BC,则下列结论中不正确的是( )

7.(3分)(2015?玉林)学校抽查了30名学生参加“学雷锋社会实践”活动的次数,并根据数据绘制成了条形统计图,则30名学生参加活动的平均次数是( )

第1页(共27页)

8.(3分)(2015?玉林)如图,在⊙O中,直径CD⊥弦AB,则下列结论中正确的是( )

9.(3分)(2015?玉林)如图,在?ABCD中,BM是∠ABC的平分线交CD于点M,且MC=2,?ABCD的周长是在14,则

DM等于( )

10.(3分)(2015?玉林)某次列车平均提速vkm/h,用相同的时间,列车提速前行驶skm,

11.(3分)(2015?玉林)如图,ABCD是矩形纸片,翻折∠B,∠D,使AD,BC边与对角线AC重叠,且顶点B

,D恰好落在同一点O上,折痕分别是CE,AF,则等于( )

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12.(3分)(2015?玉林)如图,反比例函数

y=的图象经过二次函数y=ax+bx图象的顶点(﹣,m)(m>0),则有( )

2

二.填空题(共6小题,每小题3分,共18分)

13.(3分)(2015?玉林)计算:3﹣(﹣1)=

14.(3分)(2015?玉林)将太阳半径696000km这个数值用科学记数法表示是km.

15.(3分)(2015?玉林)分解因式:2x+4x+2=

16.(3分)(2015?玉林)某校对学生上学方式进行了一次抽样调查,并根据此次调查结果绘制了一个不完整的扇形统计图,其中“其他”部分所对应的圆心角是36°,则“步行”部分所占百分比是. 2

17.(3分)(2015?玉林)如图,等腰直角△ABC中,AC=BC,∠ACB=90°,点O分斜边AB为BO:OA=1:,将△BOC绕C点顺时针方向旋转到△AQC的位置,则

∠AQC=.

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18.(3分)(2015?玉林)如图,已知正方形ABCD边长为3,点E在AB边上且BE=1,点P,Q分别是边BC,CD的动点(均不与顶点重合),当四边形AEPQ的周长取最小值时,四边形AEPQ的面积是.

三.解答题(共8小题,满分66分)

019.(6分)(2015?玉林)计算:(﹣3)×6﹣

20.(6分)(2015?玉林)解不等式组:

21.(6分)(2015?玉林)根据图中尺规作图的痕迹,先判断得出结论:,然后证明你的结论(不要求写已知、求证)

+|π﹣2| ,并把解集在数轴上表示出来.

22.(8分)(2015?玉林)现有三张反面朝上的扑克牌:红桃2、红桃3、黑桃x(1≤x≤13且x为奇数或偶数).把牌洗匀后第一次抽取一张,记好花色和数字后将牌放回,重新洗匀第二次再抽取一张.

(1)求两次抽得相同花色的概率;

(2)当甲选择x为奇数,乙选择x为偶数时,他们两次抽得的数字和是奇数的可能性大小一样吗?请说明理由.(提示:三张扑克牌可以分别简记为红2、红3、黑x)

23.(9分)(2015?玉林)如图,在⊙O中,AB是直径,点D是⊙O上一点且∠BOD=60°,过点D作⊙O的切线CD交AB的延长线于点C,E为

(1)求证:四边形BCDE是平行四边形;

(2)已知图中阴影部分面积为6π,求⊙O的半径r.

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的中点,连接DE,EB.

24.(9分)(2015?玉林)某超市对进货价为10元/千克的某种苹果的销售情况进行统计,发现每天销售量y(千克)与销售价x(元/千克)存在一次函数关系,如图所示.

(1)求y关于x的函数关系式(不要求写出x的取值范围);

(2)应怎样确定销售价,使该品种苹果的每天销售利润最大?最大利润是多少?

25.(10分)(2015?玉林)如图,在矩形ABCD中,AB=5,AD=3,点P是AB边上一点(不与A,B重合),连接CP,过点P作PQ⊥CP交AD边于点Q,连接CQ.

(1)当△CDQ≌△CPQ时,求AQ的长;

(2)取CQ的中点M,连接MD,MP,若MD⊥MP,求AQ的长.

26.(12分)(2015?玉林)已知:一次函数y=﹣2x+10的图象与反比例函数y=(k>0)的图象相交于A,B两点(A在B的右侧).

(1)当A(4,2)时,求反比例函数的解析式及B点的坐标;

(2)在(1)的条件下,反比例函数图象的另一支上是否存在一点P,使△PAB是以AB为直角边的直角三角形?若存在,求出所有符合条件的点P的坐标;若不存在,请说明理由.

(3)当A(a,﹣2a+10),B(b,﹣2b+10)时,直线OA与此反比例函数图象的另一支交于另一点C,连接BC交y轴于点D.若

=,求△ABC的面积.

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篇二:2015广西玉林中考英语试题

p class="txt">(本试卷共七大题,考试时间120分钟,满分120分。)

注意事项:

1.本考卷分试题卷和答题卡。请将答案填写在答题卡上,在试题卷上作答无效。考试结束后,将本试.........

卷和答题卡一并交回。

2.选择题每小题选出答案后,请用2B铅笔把答题卡上对应题目的选项标号涂黑。

3.非选择题,请用直径0.5毫米黑色签字笔在答题卡上各题的答题区域内作答。

一、听力理解(共30分)

(一)听句子,选图画。(每小题1分,共5分)

你将听到5个句子。请根据所听到的内容,选出与句子内容相符的图画选项。每个句子读一遍。

1._________2._________3. _________4. _________5. _________

(二)对话理解。(每小题1分,共10分)

第一节:听下面5段对话,每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,每段对话仅读一遍。

6. What’s the matter with David?

A. He has a cold.B. He has a stomachache. C. He has a sore throat.

7. What is Tony doing now? He is ______.

A. taking a showerB. going on a trip C. taking a picture

8. What is Jack going to be when he grows up?

A. A writer. B. A player. C. A singer.

9. How much should the woman pay?

A. 5 yuan. B. 10 yuan. C. 15 yuan.

10. Why does Jane have to leave now? Because ______.

A. she has a meeting

B. she has a dinner party

C. she has to take care of her mother

第二节:听下面2段对话,每段对话后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项。每段对话读两遍。

听第一段长对话,回答第11至12小题。

11. Where is the supermarket?

A. On the first floor.B. On the second floor.C. Behind the bookstore.

12. What time does the shopping center close today?

A. At 9:30 pm. B. At 10:00 pm. C. At 10:30 pm. 听第二段长对话,回答第13至15小题。

13. How many years haven’t they seen?

A. 4.B. 5. C. 6.

14. What color did Lucy’s hair use to be?

A. Red. B. Brown.C. Black.

15. What does Bob look like now?

A. He is tall with glasses. B. He is short with glasses. C. He is tall with curly hair.

(三)短文理解。(每小题2分,共10分)

你将听到一篇短文。请根据所听到的短文内容,选择正确的答案。短文读两遍。

16. When did the story happen?

A. Last Friday. B. Last Saturday. C. Last Sunday.

17. Who drove the yellow car?

A. A man. B. A woman. C. A policeman.

18. How was the weather that day?

A. Sunny. B. Cloudy. C. Rainy.

19. Ms. White felt ______ to see a policeman.

A. afraid B. happyC. surprised

20. Why did the man follow Ms. White? Because ______.

A. he wanted to hurt Ms. White

B. he was Ms. White’ s old friend

C. he wanted t give the wallet back to Ms. White

(四)听短文,填信息。(每小题1分,共5分)

你将听到一篇短文。请根据所听到的短文内容,填入信息(每空一词)。 短文读两遍。

21. ________ 22. _________ 23. _________24. _________ 25. ________

二、语言知识运用(共20分)

(一)单项选择(每小题1分,共10分)

从各小题所给的A、B、C、D四个选项中选出最佳答案。

26. Miss Lee taught me to be ______ honest person. I will never forget ______ words that she said.

A. a; theB. a; / C. an; the D. an; /

27. I am hungry. I’d like to have some ______.

A. riceB. sandwichC. dumplingD. egg

28. —Were you at home at 9:30 last night?

—Yes, I ______ Running Men at that time. It’s my favorite TV show.

A. watchB. have watched C. am watching D. was watching

29. His hobby is ______ singing ______ dancing. It’s drawing.

A. either; or B. neither; norC. both; andD. not only; but also

30. —Is the man over there Mr. Miller?

—It ______ be him. He has gone to Shanghai on business.

A. mightB. must C. can’t D. mustn’t

31. —Sonia, is this your dictionary?

—No, it’s not ______. Ask Alan, Maybe it belongs to ______.

A. my; him B. my; his C. mine; himD. mine; his

32. Qomolangma is ______ than any other mountain. I hope to climb it one day.

A. highB. higher C. highest D. the highest

33. —Who’s the little girl in the photo?

—It’s me. The photo ______ 10 years ago.

A. tookB. is takenC. has takenD. was taken

34. ______ interesting the book is! I want to buy one, too.

A. How B. What C. How an D. What an

35.—I wonder ______ without water.

—For about a week.

A. how long can a man live B. how long a man can live

C. when can a man live D. when a man can live

(二)完形填空(每小题1分,共10分)

阅读下面短文,掌握其大意,从各小题所给的A、B、C、D四个选项中选出最佳选项。

Life is full of unexpected. __36__ a cold winter afternoon, a man saw

an old lady standing by her expensive car and clearly she needed help.

So he stopped and __37__ his old truck. “Is he going to hurt me? He doesn’t

look safe,” the old lady was __38__.

The man could see that she was afraid, so he said in his friendliest

voice, “I’m here to help you, madam. Why don’t you __39__ in the car where it’s warm? By the way, my name is Ted Johnson.” Ted quickly fixed the car and the lady thanked him. The she asked __40__ she could pay him.

But Ted wanted no money. He was just giving a hand to someone in trouble. __41__ was normal for him to do such a thing like that. He said. “ If you really want to repay(报答)me , next time you see someone in need, think of me and help them.”

After saying goodbye, the lady continued down the road until she reached a small __42__ where she decided to stop for something to eat. As the pretty waitress took her order, the lady noticed she was nearly eight months pregnant(怀孕). The waitress looked tired and week, __43__ she was very kind. As the lady was going to pay the $10 bill, she remembered Ted’s words.

After the lady was gone, the waitress saw a small note on the table. It said, “Somebody once helped me the way I’m helping you. Continue being kind to other people.” Under the note were five __44__ dollars.

The waitress was __45__ excited that she called her husband to tell him the news, “Ted?Ted

三、阅读理解(每小题2分,共30分)

阅读下面A、B、C、D四部分信息或短文,根据信息或短文内容,从下列各小题所给的A、B、C、D四个选项中,选出最佳答案。

46. When can we see the movie Fast and Furious 7 in Golden Cinema?

A. April 1.B. May 1.C. May 7.D. Every day.

47. Where can you buy cheaper clothes?

A. In Golden Cinema. B. In Bridge Street.

C. In Star Clothes Store. D. In Chaoyang Road.

48. Bob is a student. He is going to Colorful Pastoral with his parents this Sunday. How should they pay?

A. ¥20.B.¥30.C.¥50.D.¥80.

B

One morning a boy went home with his father. They noticed a

pair of old shoes by the roadside. They thought the shoes

might be a poor man’s. In fact, the owner of the shoes was

working in the field nearby, and he had nearly finished

his work.

The boy said to his father, “Let’s play a trick on the man—we hide his shoes,

and wait to see what he will do when he can’t find them.”

“My boy, we should never have fun by tricking other people like that,” answered his father. “Instead, let’s put a coin in each of the shoes, and watch he will do.”

The boy did so, and then they hid nearby.

The man soon back to get h is shoes, but when he put his foot into one of his shoes, he felt something in it. He bent(弯曲)down and found the coin.

Surprise appeared on his face. He looked at the coin for a minute, and then looked around, but nobody could be seen. He then went on to put on the other shoe, but he was even more surprised to find the second coin.

He then went down on his knees, looked up to the sky and said thanks aloud. He said his wife was ill and his children were hungry. He wanted to buy some bread for them.

The boy was deeply moved.

“Now,” said his father, “you must be much more pleased than if you had played your trick.” The boy replied, “You have taught me a lesson which I’ll never forget. Now I understand these words, which I didn’t understand before: It is more blessed(神圣的)to give than to receive.”

49. How did the boy want to deal with the shoes at first?

A. To hide the shoes. B. To steal the shoes.

C. To put coins in the shoes. D. To return the shoes.

50. How many coins did the man find?

A. One. B. Two.C. Three. D. Four.

51. What would the man do after he got the coins? He would ______.

A. give them to his wife B. buy a pair of new shoes

C. give them back to the boy D. buy some bread for his family

52. At last, the boy knew ______.

A. it was funny to play tricks B. it was good to help each other

C. it was better to give than to receive D. it was wrong to put coins in the shoes

C

Yang Hui was born in Longyan, Fujian. She grew up in a small village.

She lost all her fingers and feet when she was three. She was badly burnt

by accident when she went out with her grandparents. She couldn’t walk

and she seldom went out.

The young girl had to learn to do everything. At first she wasn’t able to use chopsticks. Her parents had to teach her for a long time. Thanks to her strong will(意志)to do everything by herself, she overcame those difficult times. Now she can look after herself. She also loves studying and she has finished the junior high school courses.

About five years ago, Yang Hui saw someone make cross-stitch(十字绣)and she decided to learn to make it herself. As you can imagine, it’s very difficult to make it without fingers. Yang Hui failed so many times. But she never gave up. And through many hours of practice, now she can use her arms to make good cross-stitch works and she is(转自:wWw.DXf5.Com 东星 资源网:玉林市中考试题) faster than other people. “One had to put great efforts into what she was doing.” Yang Hui said.

Now she is 21 years old and she is in hospital in Fujian. She continues making a 1.83-meter-long cross-stitch work with arms. She has no enough money for her operations(手术). Many kind-hearted people come to visit her and call on people to raise money for her.

As for her future, Yang Hui said, “I hope to stand up and walk one day after operations. I want to make more money by selling cross-stitch works.”

If you want to know more about Yang Hui and help her, please call 13004982348.

(From Fuzhou News)

53. Why did Yang Hui lose her fingers and feet? Because ______.

篇三:2014玉林市中考试题(含答案)

化学(考试时间90分钟,满分100分)

注意事项:1.请将答案填写在答题卡上,在试卷上作答无效。考试结束,将本试卷和答题卡一并交回。2.选择题每小题选出答案后,用2B铅笔把答题卡上对应题目的选项标号涂黑。3.非选择题用直径0.5毫米黑色墨水签字笔在答题卡上各题的答题区域内作答。 可能用到的相对原子质量:C-12 H-1O-16S-32Cl-35.5

Na-23 Ca-40 Mg-24 Al-27 Zn-65

第一部分 选择题(共40分)

一、相信你的选择(本题包括20小题,每小题2分,共40分,每小题只有一个选项符合题意,多选、错选、不选均不给分。)

1.根据日常经验和你所学知识,判断下列变化属于化学变化的是

A.湿衣晾干 B.苹果腐烂C.石蜡熔化 D.辣椒剁碎

2.下列物质属于纯净物的是

A.调和植物油B.海水 C.液态氧 D.洁净的空气

3.在下图所示的标志中,加油站必须张贴的是

A. B. C. D.

4.空气成分中能供给人体呼吸的气体是

A.稀有气体B.氧气 C.氮气 D.二氧化碳

5.下列物品使用的主要材料,属于有机合成材料的是

A.不锈钢汤勺 B.塑料玩具C.羊毛围巾 D.纯棉T恤

6.碳元素和氧元素最本质的区别是

A.质子数不同 B.中子数不同

C.相对原子质量不同 D.中子数和核外电子数之和不同

7.今年年初,我国许多地区频繁出现雾霾天气,PM2.5是造成这种天气的“元凶”之一,下列做法不会增加空气中的PM2.5的是

A.焚烧秸杆B.植树造林,做好环境的绿化美化

C.燃烧鞭炮D.工厂排放烟尘

8.科学施用化肥是农业增产的重要手段,下列属于氮肥的是

A.K2CO3B.Ca(H2PO4)2 C.CO(NH2)2 D.K2SO4

9.下列物质中属于溶液的是

A.蔗糖水 B.果酱 C.蒸馏水D.牛奶

10.正确的实验操作是科学探究成功的基础,下列实验操作正确的是

11.市售的加碘食盐是在食盐中加入一定量的碘酸钾(KIO3).在碘酸钾中碘元素的化合价是

A.+2 B.+3 C.+4 D.+5

A.葡萄汁(pH≈4) B.食醋(pH≈3) C.矿泉水(pH≈7)D.牙膏(pH≈9)

14.能源和环境是人 类生存的基本条件,下列叙述错误的是

A. 过量排放CO2会形成酸雨B. 发展氢能是开发新型能源

C. 石油是一种不可再生能源D. 限制生产含磷洗衣粉可减少水污染

15.“关爱生命,拥抱健康”是人类永恒的主题,下列做法科学的是

A.霉变大米、花生等蒸煮食用 B.多吃腌制的食品

C.用地沟油加工食品 D.骨头汤煲好后放入加碘食盐调味

16.中学生要有一定的安全常识,下列做法不合理的是

A.在山林中遇火灾时,向顺风方向奔跑,逃离火灾区

B.被围困在火灾区时,应用湿毛巾捂住口鼻并尽量贴近地面逃离

C.室内起火,不要急于打开所有门窗

D.夜间发现燃气泄漏应关闭阀门开窗通风,不能立即开灯

17.右图是A、B、C三种物质的溶解度曲线,下列说法错误的是

A.t1℃时,A、B、C三种物质的溶解度由大到小的顺序是

C>B>A

B.当A中含有少量B时,可以通过冷却热饱和溶液的方法提纯A

C.升高温度可使接近饱和的C溶液变为饱和

D.将t

2℃时A、B、C的饱和溶液同时降温至t1℃后,所得溶液中

溶质的质量分数由大到小的顺序是C>B>A

18.某粗盐固体样品中含有少量CaCl2、MgCl2、Na2SO4、MgSO4和泥沙,进行以下操作可得到纯净的NaCl晶体:①加过量的NaOH溶液;②加H2O溶解;③加过量的BaCl2溶液;④过滤;⑤蒸发;⑥加过量的Na2CO3溶液;⑦加适量的稀盐酸,则正确的操作顺序是( )

A.②①⑥③④⑦⑤ B.②①③⑥⑦④⑤ C.①⑥②③④⑤⑦ D.②③①⑥④⑦⑤

19.锌粉、铝粉、镁粉的混合物3.8g与一定质量的稀硫酸恰好完全反应,生成氢气0.2克,将反应后的溶液蒸发水分,则得固体硫酸锌、硫酸铝、硫酸镁的混合物的质量为

A.13.6g B.13.4 g C.12 gD.11g

20.下列各组溶液中,不用其它试剂就能鉴别的是

A.H2SO4、Na2SO4、BaCl2、AlCl3B.BaCl2、CuCl2、NaNO3、Na2SO4

C.H2SO4、NaOH、MgCl2、Ba(NO3)2D.Na2CO3、HCl、CaCl2、(NH4)2CO3

第二部分 非选择题(共60分)

二、考考你的知识和技能(本题包括5小题,每空1分,共26分。)

21.用化学符号填空:(1) 2个氮原子(2)2个氢分子

(3) 3个亚铁离子;(4) 天然气的主要成分是

22.化学就在我们身边,请从下列物质中选择相应的序号填空①石墨 ②活性炭③钛合金 ④生石灰 ⑤酒精

(1)实验室常用的燃料是 ;(2)能用于吸附冰箱异味的是 ;

(3)常用作食品干燥剂的是 ;(4)可用于制铅笔芯的是 ;

(5)可用于制造人造骨的是 ;

23.下表为元素周期表中部分元素的相关信息,请利用下表回答相关问题.

(1)氮原子的核电荷数为 ;

(2)11号元素的原子在化学反应中比较容易 (选填“得”或“失”)电子.该元素属于 (选填“金属”或“非金属”)元素;

(3)由钠元素和硫元素形成化合物的化学式是;

(4)同一周期中,从左到右各元素的原子最外层电子数逐渐 。

24.厨房中蕴含许多化学知识,请根据下列要求回答问题。

(1)许多人都喜欢吃牛肉,牛肉中富含的基本营养素是 。

(2)判断煮饭用的水是硬水还是软水。取适量的水,加入肥皂水检验,若观察到水中起泡沫较少浮渣较多,则证明是(填“硬水”或 “软水”),生活中降低水的硬度常用的方法是 。

(3)现在铁锅越来越受到人们的青睐。用铁锅炒菜主要是利用铁具有良好的 性,同时还可补充人体所需的铁元素,如果铁元素摄入量过少会引起。

(4)炒菜时,燃气灶的火焰呈黄色,锅底出现黑色,此时可将灶具的进风口(填“调大”或 “调小”);油锅中的油不慎着火,可用锅盖盖灭,其灭火原理是。

(5)餐具上的油污可用洗洁精来洗掉,这是利用洗洁精的(填“溶解”或 “乳

化”)作用。

25.实验室配制50克质量分数为12%的氯化钠溶液。下图是小军实验操作过程示意图:

(1)图中一处明显错误的操作是(填序号),改正操作后,用上述图示的序号表示配制溶液的正确操作顺序 。

(2)图①中玻璃棒搅拌的目的是。

(3)配制时应选择 (填“10” “50”或 “100”)mL的量筒来量取所需水的体积。

三.测测你的推断与表达能力(本题包括2小题,化学方程式每空2分,其余每空1分,共12分。)

26铁是应用最广泛的金属。

(1)为了检验铁生锈的条件,进行了如上图(略去其中的夹持装置)所示三个对比实验。 一段时间后,甲中铁丝发生锈蚀且试管中液面上升,乙和丙中均无明显变化。由此得出铁丝锈蚀的过程,实际上是铁丝与 、发生化学反应的过程。

(2)铁制品在下列情况:①潮湿空气中②部分浸入食盐水中③干燥的空气中 最易生锈的是 (填序号,下同),不易生锈的是 。

(3)在“南海一号”打捞出来的文物中,铁器锈迹斑斑,残存很少,而“金龙纹手镯”光彩夺目,完好无损。这说明铁的金属活动性比金的 (填“强”或“弱”)

(4)为了验证铁、铜的金属活动性顺序,除了选择用砂纸打磨干净的铁钉外,还需要选择的一种溶液是溶液。

27.下图是初中化学常见物质之间的转化关系,他们各代表不同的物质(“-”表示相邻的与两种物质可以发生反应,“→”表示箭头的物质可转化为箭头后的物质;部分反应的反应物、生成物和反应条件未标出)。其中A、H是金属氧化物,且H是红色固体粉末,F是由两种元素组成的化合物。

请回答下列问题:(1) C的化学式是 。

(2)写出物质E的一种用

途 。

(3)图中有几种物质能与F

发生反应,请你写出

其中一种物质与F发生复分解反应的化学方程式 。

(4) 写出D与H反应的化学方程式。

四.进行你的实验与探究之旅行(本题包括2小题,化学方程式每空2分,其余每空1分,共16分。)

28.气体制取是重要的化学实验活动,请根据给出的装置回答下列问题:

(1)请写出图A中仪器a的名称:①。

(2)用高锰酸钾制取并收集较纯的氧气,选择的装置是(填

字母序号)。

(3)在实验室中选用B装置制取氧气,反应原理是

;用这种方法制得的氧气常含

有少量水蒸气,若用右图所示装置除去水蒸气,气体应从(填“b”或 “c”)端进入。

(4)实验室制取二氧化碳时,可将放到集气瓶口来判断是否已集满二氧化碳气体,实验室不适宜用排水法收集二氧化碳的理由是 。

29.某兴趣小组的同学对一包在空气中敞口放置了一段时间的碱石灰产生了好奇,于是他们对这包碱石灰的成分展开了探究。

【提出问题 】他们要探究的问题是。

【查阅资料 】①碱石灰是由CaO和NaOH固体混合而成,通常用于吸收二氧化碳及干燥气体。②熟石灰固体溶解度小,溶于水放出的热量少,可以忽略不计。

【提出猜想 】该碱石灰的主要成分可能含有CaO、NaOH、Ca(OH)2、CaCO3和 。

【实验探究 】小组的同学设计实验并进行验证,过程如下:

①小明取部分该碱石灰样品于试管中,加少量水后无放热现象,说明这包碱石灰样品中不含。继续加足量水,振荡,静置后有白色沉淀,小明认为碱石灰样品中一定含有CaCO3,小美认为他的结论不准确,原因是 。(用化学方程式表示)

②从小明的试管中取少量上层清液于另一试管中,向其中滴加过量BaCl2溶液,有白色沉淀生成。

③把过程②所得物质过滤,向滤液中滴加无色酚酞溶液,溶液变红色。

【解释与结论 】根据以上探究:

①你认为该包碱石灰样品一定含有的物质是 ,可能含有的物质是 。

②实验探究过程③所得溶液中除酚酞外还含有的溶质是 。

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