下列说法中不正确的是   

A.硅主要以单质、氧化物、硅酸盐的形式存在于自然界中

B.适量CO2通入漂白粉的水溶液可以生成白色沉淀

C.在燃煤中加人石灰石可减少SO2的排放，发生的总反应为2CaCO3+2SO2+O22CO2+2CaSO4

D.不能用玻璃瓶来盛装氟化钠水溶液

里约奥运会游泳小组赛采用抽签方法决定运动员比赛的泳道．在由2名中国运动员和6名外国运动员组成的小组中，2名中国运动员恰好抽在相邻泳道的概率为      

Music is universal—it 1.           (produce) by all cultures. Some scientists believe that music came before speech. In fact, there is one theory that the 2           (early)languages were chanted or sung rather than spoken.

Indeed, in some cultures, music is a form of 3.          (record) history. The Aboriginal Australians, for example, use music as 4.          means to pass on stories of the land and spirits to the next generation. New evidence suggests that music does not just satisfy the feel-good factor but it 5.          (be) also good for the brain. A study of 6.           (mental) disabled children showed that they could recall more information after it was given to them in a song than after it was read to them 7.          a story.

Researchers also report that people score better on a standard 8.          (intelligent) test after listening to Mozart. The so called “Mozart effect” has also been supported by findings that rats 9.          (bring) up on Mozart run faster through a complex network of paths or passages known as a maze(迷). Overall, it seems that in most instances people l0.          from any form of mental illness can benefit from listening to music.

The other day, I happened to meet someone I hadn't seen for many years. I couldn't believe the change in him. As a matter of fact, he didn't even seem like the  11   person.

When I first knew Bill, back in   12  , he was one of the most carefree(无忧无虑的) people I had ever met. He was always ready to have a party. He was always ready to have a party. He thought   13   of going went out for beer at three o'clock in the morning or drove 50 miles to see an old   14   he really liked. Bill and I were in the same class in college, and life was never dull when he was   15  . With him there was one wild   16   after another. Sometimes I wonder how we managed to study for our exams.

Last week I was in Houston on business, and I ran into Bill in the bar at the hotel.   17  , I wasn't even   18   it was he. Was this short-haired businessman really the same person? I wasn't really sure until I came near him, but it indeed was Bill. Now he works for a bank. He   19   most of the evening about his job, his new car and his house. How he had changed! Back when we were in college, the   20   thing Bill cared about was possessions(财产). Now they seemed to be his main   21  . Although I have changed quite a bit myself, somehow, I never imagine Bill changing so much. My image of him   22   the one I had formed at the time when we were college students together.    

I suppose it's   23   to expect people to remain the same, especially   24   I have changed so much myself. But I must say that I enjoyed the old Bill much more than

the new Bill. Maybe he   25   the same way about me.

11. A. proper                        B. same                        C. usual                  D. right

12. A. childhood         B. the army             C. his thirties           D. college

13. A. nothing                B. much                  C. most               D. none

14. A. man                  B. hospital               C. movie                        D. country

15. A. in                        B. out                      C. away                     D. around

16. A. adventure           B. mistake               C. chance                   D. joke

17. A. First of all        B. At first            C. Now and then   D. All the time

18. A. glad                    B. excited              C. surprised           D. sure

19. A. thought                B. talked               C. argued                   D. spent

20. A. first                     B. last                     C. next                D. only

21. A. interest               B. event                  C. subject                   D. problem

22. A. remained            B. reminded            C. suggested             D. became

23. A. unnecessary              B. foolish                 C. common         D. unusually

24. A. because             B. that                     C. how                D. when

25. A. felt                        B. acted                    C. looked                       D. discovered

读下面两幅图。据此完成下列小题。

【1】北京时间16时20分一架飞机经过图中甲地，恰好日落，则这一天图中甲乙丙丁四地最晚观测到日落的地点是
A.甲 B.乙
C.丙 D.丁
【2】上右图是某同学在丁地拍摄的太阳照片（太阳位于海平面上），照片拍摄当天，太阳直射点最有可能位于
A.北回归线 B.赤道
C.南回归线 D.南极圈

已知三个向量共面，均为单位向量， 0，则的最大值为______.

2．下列各句中，加横线的词语运用不正确的一项是

A．他爱好广泛，喜欢安静的棋类运动，对热闹的纸牌游戏也来者不拒；欣赏通俗感性的流行歌曲，对庄重恢宏的交响乐也甘之如饴。

B．荧屏上，他沉着大方，点评时事亦庄亦谐，精辟的见解让人折服；镜头外，他开朗乐观、热心助人，是邻居、朋友心中的活雷锋。

C．虽然最初并不相信自己涉嫌犯罪，但由于电话那头的骗子言之凿凿，加上所谓最高检的“全国通缉公告”，信息闭塞的受害人最终成了骗子的猎物。

D．在媒体的长枪短炮前，明星们也许悟出了言多必失的道理，鲜有人会再聚光灯前竹筒倒豆子，少说、不说成了他们自我保护的明智选择。

迪亚士认为，“（海上探险）是为了像所有的男子汉都欲做到的那样，为上帝和陛下服务，将光明带给那些尚处于黑暗中的人们。”该材料表明新航路的开辟者要传播

    A． 资本主义生产方式                B． 文艺复兴的人文思想

    C． 基督教的教义                    D． 启蒙运动的理性主义

 It will be about 50 days __________ the College Entrance Examination comes.

A. when    B. as    C. before    D. since

 (12分)阅读材料，完成下列要求。

  材料洋务运动期间，官督商办企业上海机器织布局“机会与威胁”分析表

根据材料并结合所学知识，对表中的“因素”分别给予一个补充，并说明其“启示”。（补充的“因素”及“启示”需观点正确，符合历史事实。）

  请考生在第29、30、31三道题中任选一题作答，如果多做，则按所做的第一题计分。

如图所示倾角θ=30°的固定斜面上固定着挡板，轻弹簧下端与挡板相连，弹簧处于原长时上端位于D点．用一根不可伸长的轻绳通过轻质光滑定滑轮连接物体A和B，使滑轮左侧绳子始终与斜面平行，初始时A位于斜面的C点，C、D两点间的距离为L．现由静止同时释放A、B，物体A沿斜面向下运动，将弹簧压缩到最短的位置E点，D、E两点距离为．若A、B的质量分别为4m和m，A与斜面的动摩擦因数μ=，不计空气阻力，重力加速度为g，整个过程中，轻绳始终处于伸直状态，则：（　　）

A．A在从C至E的过程中，先做匀加速运动，后做匀减速运动

B．A在从C至D的过程中，加速度大小为g

C．弹簧的最大弹性势能为mgL

D．弹簧的最大弹性势能为mgL

通常情况下，分子式 C₆₃H₁₀₃O₆₅N₁₇S₂的多肽化合物中最多含有肽键（）

      A．63个                           B． 62个                     C．   17个      D． 16个

设f（x）是定义在R上且周期为2的函数，在区间[ −1,1)上，其中若，则f（5a）的值是       .

观察一个社会的发展程度，不能只看摩天大楼，还要看社会底层、困难群体的生活状况，搞好民生，特别注重“补短板、兜底线”，这样才能保障全面建成小康社会。有利于实现“ 补短板，兜底线”的做法是

①弥补市场调节的弊端，避免经济波动起伏  ②加强和完善社会保障，健全养老保险制度 

③消除城乡发展差距，实现经济的共同发展  ④加强对特困者的社会救助，提高低保标准

A．①③             B．①④             C．②③             D．②④

1938年东欧国家对西欧国家出口占其出口总额的68．4%，而1953年仅有14．4%出口产品输往西欧，这一现象出现的主要原因是（　 　）     

A．第二次世界大战对欧洲的破坏        B．西欧关税同盟的形成阻碍了东西欧联系 

C．国际政治影响经济全球化推进        D．苏联模式的引入迟滞了东欧现代化进程

已知椭圆的左右焦点为，抛物线C：以F₂为焦点且与椭圆相交于点M，直线F₁M与抛物线C相切。

（Ⅰ）求抛物线C的方程和点M的坐标；

（Ⅱ）过F₂作抛物线C的两条互相垂直的弦AB、DE，设弦AB、DE的中点分别为F、N，求证直线FN恒过定点；

对于维持细胞内的酸碱平衡、调节渗透压、维持细胞的形态和功能有主要作用的物质是

    A．蛋白质           B．无机盐           C．脂肪             D．结合水

2019年7月18日，针对英国仍试图以《中英联合声明》来主张英国在香港事务上所谓的“权利，我国外交部指出，香港回归后英国对香港没有任何权利，希望英方能醒一醒，英方应拿出实际行动来维护中英关系大局。下列对材料解读正确的是
①我国在国际事务中的代表性和话语权进一步增强
②在国际法上，主权国家的地位是由国家力量决定的
③英国的主张干涉了中国内政，没有履行主权国家义务
④中国的态度表明，我们坚决捍卫国家的主权和利益
A.①② B.①③ C.②④ D.③④

2014年4月17日，一位诺贝尔文学奖得主去世。人们评价他的一部名著：“反映了拉丁美洲一个世纪以来风云变幻的历史，揭示了拉丁美洲民族深层的文化和心理特征，表达了作者对于拉丁美洲民族命运的深层思考和热情关注。作品融入神话传说、民间故事、宗教典故等神秘因素，巧妙地糅合了现实与虚幻，展现出一个瑰丽的想象世界”。与这一流派相似的著作是（   ）

A.《百年孤独》     B.《人间喜剧》     C.《老人与海》     D.《悲惨世界》