题干

某校高一举行了一次数学竞赛,为了了解本次竞赛学生的成绩情况,从中抽取了部分学生的分数(得分取正整数,满分为100分)作为样本(样本容量为n)进行统计,按照[50,60),[60,70),[70,80),[80,90),[90,100]的分组作出频率分布直方图,并作出样本分数的茎叶图(图中仅列出了得分在[50,60),[90,100]的数据).

上一题 下一题 0.0难度 选择题 更新时间:2019-04-10 09:22:51

答案(点此获取答案解析)

同类题4

根据短文理解,选择正确答案。

My Hero

    What does it mean to be a hero? I think a hero is someone who goes out of his way to make others happy. My hero is Mr. Wright, my chorus(合唱队) teacher.

    When I was 12 years old, my grandparents passed away. I was really close to them, and losing them was the hardest thing I've ever had to1through. I couldn't eat, sleep, or think; I felt like I couldn't even breathe. It was as if my whole world had fallen down from under me, and I2into this huge hole of depression(抑郁).

    3I was battling depression, I was determined to make my high school years the best of my life. It was difficult to be 4, but I had to try. I joined Women's Choir. Mr. Wright was the choral director and he was so funny that the first day, I just knew I had made the best5of my life. As the year progressed, I loved chorus more and more. I began to smile again and really enjoy 6.

    Then one day that all changed. My friends—or those that I thought were my friends—started talking about me behind my back. I was7 , and I sat by myself. Mr. Wright came over and asked what was wrong. The look in his eyes told me that I could8him. Trying hard to9 back tears, I told him the whole story.

    When I finished, he nodded and told me, “If you never learn anything from me, learn this: No one is worth 10 your joy.” What Mr. Wright said really11a chord (心弦) in my heart. He 12 cared about me and what was going on. I'll never be able to thank him enough, because he not only saved me but has13every day of it since. Any time I feel like giving 14, I remember Mr. Wright's words and push forward.

    I'm proud to say that I 15 my depression, and I'm now a senior. I'm still a16of chorus, and now I'm also in the best choir at my school.

Mr. Wright is a hero 17 everyone he meets. He cares about every single person who walks through his door, and he loves what he does more than any other teacher I've known. That's18  he deserves to be Educator of the Year. He deserves the19 not just this year but every year.

    I'm glad I had the opportunity to meet you, Mr. Wright. You are an 20teacher, and I hope you realize that. You're my hero.

同类题5

五四运动是中国新民主主义革命的开端。第一次国共合作推动了国民革命运动的高涨。阅读下列材料:

材料一:一九一九年五四运动大事记(部分)

时间

大事

五月五、六日

北京总商会为学生被捕事开紧息会议,决以实力赞助学生。

五月七日

上海举行国民大会。天津、南京等城市群众也先后集会声援北京学生。

五月二十日

北京、武汉等地商界议决抵制日货办法。

六月五日

上海工人开始罢工,要求释放学生,昙免曹、章、陆。各地工人纷纷响应。



——摘编自彭明《五四运动史》

材料二:1924年国民党的改组对孙中山重振声威大有帮助,可以统一所有的革命力量在孙中山的领导之下。国民党重视并开展民众这动,也是在改组之后出现的新现象。这一时期,中国民族主义与爱国主义时趋高涨,各界民众反帝爱国的积极行动越来越踊跃。民众运动的开展,为北伐的酝酿与进行创造了十分有利的环境。

——摘编自朱英《北伐之前的国民党与民众这动》

材料三:1924-1927年国共合作实际上是以“国民革命”为号召的民族革命。这场革命的直接斗争目标就是所谓“打倒列强除军阀”,北伐战争即为这场革命最具体的实现手段。北代战争这一军事统一运动,从一个侧面清楚地反映出,中国社会民族主义观念广泛发酵,多数社会大众对国家统一运动明显抱以期待和欢迎的态度。

——摘编自王建郎、黄充武主编《两岸新编中国近代史》(民国卷)

请回答: