2021年5月22日，第19届广西青少年机器人竞赛暨东盟国家及粤港澳青少年机器人邀请赛在贺州学院拉开序幕。经过激烈角逐，平桂区实验小学代表队勇夺3D打印笔工程挑战赛广西冠军，平桂区道石学校代表队勇夺机器人基本技能比赛广西冠军。这启示(    )

①每个人都可以是创新者

②创新不唯年龄，不唯学历

③每个人都可以在创新中实现自我价值

④万众创新理念已经深入所有人的心中

A ． ①②③ B ． ①③④ C ． ①②④ D ． ②③④

已知 20 ℃时 CuSO ₄ 的溶解度为 32g 。 20 ℃时，取一定质量某 CuSO ₄ 溶液于烧杯中，按下图进行实验 ( 整个过程中忽略溶剂损失 ) ，下列说法不正确的是

A ． 溶液中溶质质量分数的大小关系为丁 > 丙 > 甲

B ． 丙中溶液溶质与溶剂的质量比为 8:25

C ． 丁溶液一定是饱和溶液

D ． CuSO ₄ 50 ℃时的溶解度比 20 ℃时的大

下列有关说法正确的是

A ． 水的离子积常数 K _w 随着温度的升高而增大，说明水的电离是放热反应

B ． 镀铜铁制品镀层受损后，铁制品比受损前更容易生锈

C ． N ₂ ( g )＋ 3H ₂ ( g )⇌ 2NH ₃ ( g ) △ H ＜ 0 ，其他条件不变时升高温度，反应速率 v ( H ₂ )和氢气的平衡转化率均增大

D ． 常温下，反应 CaCO ₃ ( s )= CaO ( s )＋ CO ₂ ( g )为吸热反应，说明生成物的焓大于反应物的焓

My grandma can use WeChat （微信） . She learns it all by ________.

A ． she B ． herself C ． her D ． hers

某校男子篮球队名队员进行定点投篮练习，每人投篮次，将他们投中的次数进行统计，制成下表：

投中次数
人数

 

则这名队员投中次数组成的一组数据中，众数和中位数分别为（    ）

A．，                   B．，                   C．，                   D．，

 在开展呼吸作用的实验研究之前，小雨根据生物学知识指出：“人体呼吸作用时，呼出的气体中可能比吸入的气体含较多的水蒸气”。这在科学研究中属于（      ）

A．猜想或假设       B．提出问题      C．制定计划      D．结论

There were a large number of ________( 候选人，申请人 ) for the job. ( 根据汉语提示单词拼写 )

北宋沈括编撰的《梦溪笔谈》中，记录了用CuSO₄溶液熬制胆矾的铁釜，使用时间久了也可以化作铜。

（1）由上述材料分析，Fe比Cu的金属活动性       （填“强”或“弱”）。

（2）如果向足量的CuSO₄溶液中加入5.6gFe粉，充分反应后，理论上可以得到Cu的质量是多少？

用化学符号或名称填空。

（1）碳原子____________。

（2）氮分子____________。

（3）钾离子____________。

（4）硫元素____________。

（5）氯化钠____________。

（6）MgO____________。

观察下图，该战争形势图所示的是

A ． 广州起义 B ． 武昌起义 C ． 二次革命 D ． 护国战争

2019年 2月，为了加强烟花爆竹管理，防治大气污染，防止人身伤害和火灾事故发生，我市出台《青岛市禁止燃放烟花爆竹的规定（修订草案征求意见稿）》，公开征求社会意见。对以下意见，你认为正确的是

A．赞同，可以杜绝人身伤害和火灾事故发生

B．赞同，有利于改善我市城市环境和空气质量

C．不赞同，减少烟花爆竹销售量，会严重阻碍我市经济发展 D．无所谓，这是政府部门的事情，和我们关系不大

水是生命之源。下列关于水的操作正确的是

A ． 活性炭净水器净水 B ． 除水中不溶物

C ． 量水的体积 D ． 测水的 pH

图为 “ 我国 40°N 附近某城市年内各月气温与降水量柱状图 ” 。图示气候类型是

A ．亚热带季风气候

B ．温带季风气候

C ．温带大陆性气候

D ．地中海气候

A horse fair is an interesting place. There were young horses from the country, little Welsh ponies and many beautiful horses too. But there were also a lot of poor, thin horses, tired from hard work. I was very sad to see them.

At the horse fair there was a man with a gentle voice and kind grey eyes. He offered 23 pounds for me, but they refused. Then a man with a very loud voice came. I was afraid he was going to buy me, but he walked off. Then the grey-eyed man came back again and said:

“I’ll give 24 for him.”

“Done,” said the salesman. “He’s a quality horse and if you want him for cab（出租马车）work, he’s a bargain.”

Half an hour later we set off for London, along country roads, until we came to that great city. There were streets to the right, and streets to the left. We went into one of the small streets, and then into a very narrow street, with small, old houses.

My owner stopped at a house. The door opened, and a woman, a little girl and boy, came out.

“Is he gentle, father?”

“Yes, Dolly, as gentle as a kitten; you can pat him.”

Dolly, the little girl, patted my shoulder without fear. It felt so good! They led me into a comfortable, clean stable, and after a delicious meal I lay down to sleep, thinking” I’m going to very happy here”.

My new owner’s name was Jerry. His wife was called Polly and they had two children, Harry and Dolly. The next morning they came to see me. I loved it when they patted me and spoke in gentle voices.

“Let’s call him ‘Jack’, after the old horse, shall we, Harry?” said Dolly.

“Yes, let’s,” said Harry.

The first week of my life as Jack, the London cab horse was very hard. The noise and the people and the traffic on the streets scared me. But Jerry was a very good driver, and that helped a lot Jerry soon found that I was ready to work hard and do my best. and d he didn’t whip（鞭打）me.

He kept us very clean, and gave us as much food as we wanted. But the best thing was that we had Sundays off.

（    ）42. A horse fair is a place for__________.

A. people to sell and buy horses       B. horses to learn new skills

C people to learn to ride horses       D. horses to meet new friends

（    ）43. What did the salesman mean by saying “he is a bargain”?

A. The buyer is a good driver.       B. The horse is well worth the price.

C. The buyer is gentle and kind.       D. The horse is as gentle as a kitten.

（    ）44. Living and working in London with Jerry’s family, “I” felt___________.

A. sad and helpless       B. challenged but satisfied

C. tired and afraid       D. curious but impatient

（    ）45. What can be a suitable title for the passage?

A. The experiences of visiting a horse fair.

B. The chance of having a new owner.

C. The disadvantages of working in London.

D. The start of a London-cab-horse life.

麦芽糖的化学式是C₁₂H₂₂O₁₁，则每个麦芽糖分子中氢、氧原子的最简个数比为多少，麦芽糖中碳、氢、氧三种元素的质量比为多少（填最简整数比）。

图片中的中国史

请将以下标题同上述历史图片一一对应，将正确答案写在相应位置。

（ 1 ）安徽凤阳小岗村农民签订的契约书

（ 2 ）和平解放西藏

（ 3 ）一五计划

（ 4 ）香港回归

（ 5 ）汪辜会谈

（ 6 ）我国为管理西藏地区实行了哪项基本政治制度：

（ 7 ）我国为香港地区回归祖国，提出了哪一制度构想：

（ 8 ）在与台湾地区的交流中， 1992 年哪一事件使得两岸关系迈出历史性的一步：

“从生活走向物理，从物理走向社会”。对下列生活中的事例，判断错误的是（  ）

A. “小王比小李胖”是指小王的体重一定大于小李的体重

B. “铁比木头重”是指铁的密度大于木头的密度

C. 用手机上网时，不能随意点击陌生链接，防止个人信息泄露

D. 大功率家用电器需要安装漏电保护装置，否则漏电时会危及生命和财产安全

磁悬浮S1线是北京市首条具有自主知识产权的低速磁浮交通线路，依靠电磁力悬浮在特制的轨道上，运营时速可达80公里/小时，从门头沟石门营到石景山苹果园只需要15分钟。

据此，完成下面小题。
【1】北京市发展高新技术产业最大的优势是
A.临海，交通便利 B.科研院所多 C.劳动力充足 D.矿产资源丰富
【2】目前，一些非首都核心功能部门陆续迁往周边地区，原因是
① 确立北京在全国经济中心地位 ② 缓解北京交通、住房等压力
③ 提高北京大气环境质量 ④ 减少恶劣天气对北京的影响
A.①② B.③④ C.②③ D.②④

I bought a present for ________. I hope you like ________.

A．your; this               B．yours; that              C．you; it                    D．you; one

研究人员把抗稻瘟病的基因连接到易感染稻瘟病的水稻细胞的DNA分子上，培育出抗稻瘟病水稻。这种生物技术是（　　）
A. 转基因技术 B. 克隆技术 C. 微生物发酵 D. 仿生技术