问题 填空题

设X1,X2,…,Xn为来自总体X的简单随机样本,其中E(X)=μ,D(X)=σ2,令U=

,则ρUV=______.

答案

参考答案:[*]

解析:[详解]
[*]

阅读理解与欣赏

认真阅读短文,完成后面的练习。

鲁迅先生的生活情趣

  鲁迅先生十分珍惜时间,却从不把参加体育活动和搞各种有益的文化活动看做是浪费生命;恰恰相反,他把培养多方面的爱好和兴趣看做是增长知识、变换方式积极休息的手段。

  种花 鲁迅一生喜爱花草,即使没有栽种地方,也爱在书桌上摆一盆绿色的生命。少年时,鲁迅就读了许多有关花木的书籍,像《花镜》《兰惠同心录》《广群芳谱》等。中年的鲁迅最爱丁香花和木槿花。1923年,鲁迅居住在北京西三条胡同一个四舍院,就种了好几株白色和紫色的丁香花。夏秋之夜,每当夜深人静,他独自徘徊在花下,闻着略带苦涩的香气,以求解除疲劳。1924年秋天,鲁迅在西安讲学时,下榻处窗外有一丛盛开的白木槿花,他对花凝视良久,想构思一部《杨贵妃》的剧本。晚年,鲁迅定居在上海大陆新村9号时,还特地在前院种上了夹竹桃、石榴、紫荆、桃花等花木。

  看戏 鲁迅先生从小爱看绍兴的戏文。有一次,他还在民间演的目连戏中自告奋勇地扮演了一个角色。1924年夏赴西安讲课时,专程去看古老剧种秦腔的演出。鲁迅晚年定居上海后,在繁忙的写作之余,他最大的娱乐就是观剧、看电影。鲁迅常同许广平一起,携带海婴去剧院看有趣、有教育意义的新戏。他不仅看,且多有评论。

  篆刻 鲁迅先生喜好篆刻,虽刻印不多,却具备了较深的艺术功底。他少年时代,因叔父周芹候研究篆刻,耳濡目染他学会了刻印的本领。1899年,鲁迅在南京读书时,就曾刻过“戎马书生”“文章误我”“夏剑生”等印章。在鲁迅的著作中,《蜕龛印存(代)》是鲁迅论述篆刻的唯一的珍贵资料。它也是我国印学宝库中难得的理论之作。

  养鱼 有一次,内山完造先生赠送了10尾金鱼,鲁迅先生特地买来一只素白的金鱼缸,和夫人许广平一同兴致盎然地铺沙、灌水,植种掩映的碧绿水草,小心翼翼地把金鱼放进去。鲁迅先生很熟悉金鱼的生活习性,顾虑到缸面的水苔太密,会影响鱼呼吸氧气,他常暂搁手中“金不换”笔,仔细地把这些东西除去。

  绘画 鲁迅先生童年时就喜欢绘画,30年代曾为自己和别人的书刊设计过封面,也为自己的文章画过插图。“君无常”画像就是他于1927年6月25日亲笔作的一幅,至今保存在他的《朝花夕拾·后记》里。

1.在第一自然段中找出一对反义词。

(  )——(  )

2.联系上下文,解释下列词语。

(1)自告奋勇:_____________________________________________________

(2)耳濡目染:_____________________________________________________

3.这篇文章介绍了鲁迅先生种花、_________、_________、_________、_________这五个方面的兴趣和爱好。

4.鲁迅先生把“培养多方面的爱好和兴趣”看做是_________、_________的手段。

5.按提示填空,体会句子的意思。

(1)“夏秋之夜,每当夜深人静,他独自徘徊在花下,闻着略带苦涩的香气,以求解除疲劳。”“徘徊”的意思是__________________。这句话写出了__________________。

(2)“有一次,内山完造先生赠送了10尾金鱼,鲁迅先生特地买来一只素白的金鱼缸,和夫人许广平一同兴致盎然地铺沙、灌水,植种掩映的碧绿水草,小心翼翼地把金鱼放进去。”加粗词语的近义词是_________。“小心翼翼”的意思是__________________。这句话写出了__________________。

6.这篇文章表达了作者怎样的思想感情?

________________________________________________________________________

阅读理解

Getting a good education is more important today than ever before. It is the best thing you can do to build a better future for your children and yourself.

Most children in Canada attend public schools. Public schools are completely founded by governments through tax (税收) income. Boys and girls attend the same school and share the same courses and classes. Schooling in Canada is provided in English and in French.

The rest of Canadian children attend private schools,which are supported mainly by fees (费) paid directly by parents. Some private schools enroll (招收) only boys or girls.

By law,children must attend school from age 5 to 16.Children are usually in school between 8:30 or 9:00 a.m.,and 3:00 or 4:00 p.m.Monday through Friday,from September to the middle of June. There are several different levels in the Canadian education system. The first is called Elementary Schools. In most provinces Elementary Schools include Kindergarten through Grade 7 or 8.

From Grade 8 or 9 through 12 or 13,children go to Secondary School or High School. High School students must take certain courses for several years,such as English or French and mathematics. Some courses help students get a job after they graduate from school. Other courses prepare students for college or university. In Canada,teenagers usually make these choices for themselves,with the advice of their teachers,guidance counselor (指导教师) and parents.

Schools usually offer extra activities at the end of the normal school day. These include sports,games,music and clubs.

Most elementary and high schools encourage parents to take part in school activities. Parents' nights are organized from time to time. These are chances for parents to discuss their children's progress with teachers. You may wish to bring a friend with you. After graduating from high school,many young adults continue their studies through post­secondary education.

小题1:According to the passage,students in Canada can get education for free in ________.

A.private schools

B.universities

C.public schools

D.community (社区) college小题2:Which of the following statements is TRUE according to the passage?

A.Most high school students choose their courses against their wills.

B.The students do their after­class activities all the afternoon.

C.Parents are allowed to take part in school activities in the morning.

D.If you don't send your five­year­old child to school in Canada—you break the law in Canada.小题3:Which of the following is NOT true according to the passage?

A.There are only boys in some private schools.

B.There are only boys in some public schools.

C.There are both boys and girls in some private schools.

D.There are both boys and girls in all public schools.小题4:We can tell that from the middle of June to August,the students in Canada are ________.

A.on school holidays

B.in school

C.at work

D.preparing for the final examination