问题 填空题

某学校去年对实验器材的投资为2万元,预计明年的投资总额为12万元,求该学校这两年在实验器材投资上的平均增长率是         。                

答案

100%

专题:增长率问题.

分析:设平均增长率为x,关系式为:今年的投资总额+明年的投资总额=12,把相关数值代入即可.

解答:解:设平均增长率为x,

由题意得:今年的投资总额为2(1+x),明年的投资总额为2(1+x)2

∴可列方程为2(1+x)+2(1+x)2=12,

解得:x=100%,即平均增长率为100%.

故答案为:100%.

点评:此题考查一元二次方程的应用,得到今、明2年的投资额的关系式是解决本题的突破点,难度一般,注意正确解出方程,并结合实际取舍.

单项选择题
阅读理解

Today, traditional opinions about men still exist. A man has to be strong, brave, sports loving and manly. Anything less would not be considered manly. Sports such as football, basketball and boxing all tend (往往是) to be men’s sports. However, the dance of ballet is considered feminine because it requires nice movements. This tradition is shown in the movie, Billy Elliot.

Billy Elliot is a movie that protests against this traditional view of men. Billy Elliot is an eleven-year-old boy that has a natural talent for ballet dancing, but his father will not allow it. Billy’s father wants him to take up boxing and become stronger, but Billy goes against his father’s wishes and takes up ballet dancing. This difference of opinion makes Billy sad. What’s more, his friends also laugh at him.

After saving enough money, his father sends Billy to a weekly boxing course; however, Billy doesn’t enjoy boxing because he always loses in matches and is often hurt. His ballet teacher, Mrs. Wilkinson thinks that men or women should not be judged by the activities they like to do, so she tells Billy’s father that although he wants his son to make a good living, he should let his son do what he loves to do because he has a talent for it. When his father finally realizes the truth, Billy is surprised. In the end, with the help of his father, brother and all the people around him, Billy goes to the Royal Ballet Academy in London and becomes a very successful ballet dancer.

小题1:The underlined word “feminine” in the first paragraph most probably means ______

A.of men

B.of children

C.of women

D.of students小题2:Why is Billy laughed at by other children?

A.He always loses in boxing matches.

B.He isn’t strong.

C.He looks like a girl.

D.He loves ballet.小题3:What do we know about Billy?

A.His teacher encourages him to take up ballet dancing.

B.He does well in ballet dancing and boxing.

C.He does what his father wants him to do.

D.He has never taken up any men’s sports.小题4:From Billy’s story, we can see that _______.

A.children should accept their parents’ opinions

B.we should try to fight against traditional opinions

C.men and women play different sports

D.parents should let their children do what they are interested in