问题 解答题

为了加强公民的节水意识,合理利用水资源,各地采用价格调控等手段来达到节约用水的目的.某城市规定如下用水收费标准:每户每月的用水不超过6m3时,水费按每立方米0.6元收费;超过6m3时,不超过的部分每立方米仍按0.6元收费,超过的部分每立方米按1元收费.设某户每月用水量为xm3,应缴水费为y元.

(1)请写出用水不超过6m3和超过6m3时,y与x之间的函数关系式;

(2)若该户居民5月份的水费为9.6元,则该户居民5月份的用水量为多少?

答案

(1)由题意,得

当x≤6时,y=0.6x,

当x>6时,y=6×0.6+1(x-6),

y=x-2.4

则y=

0.6x(x≤6)
x-2.4(x>6)

(2)当y=9.6时,9.6=x-2.4,

解得x=12.

故该户居民5月份的用水量为12m3

阅读理解

Believe it or not,the ability to choose is the power to change.If you can choose to live your life differently,will you be the same person?

Well,choosing to do the following few “simple”things will help to change your life.

Review your life.Take time to go through your life and ask yourself, “If I do the same thing I do every day,will there be a change?If I want to change,where will my first step be?”

Make careful choices.Choose exactly what you wish to get to live your life;describe and think what you really want

Keep up with chances.Find out about the possibilities and ways that can make you move toward your goals,write them down and see which one suits you most.

Get down to business.Start working on your goals.People may bring you down;you may have difficulties;you will fail and want to give up.But the most important thing is never to give up.

If you try these “simple”things,you will find that success is something for everyone,and you will finally become what you want to be.Remember,success is more than what you hold in your hands;It is something from the heart.

小题1:How many pieces of advice does the writer give on changing one’s life?

A.Three

B.Four

C.Five

D.Six小题2:Once you get down to business,the most important thing is to         .

A.see possibilities

B.set goals

C.ask for help

D.keep on trying小题3:The underlined word “it”in the last paragraph refers to            .

A.choice

B.change

C.success

D.life小题4:This passage mainly discusses the relationship between           .

A.choice and change

B.power and life

C.choice and difficulties

D.power and success

多项选择题