问题 填空题

希望中学收到了王老师捐赠的足球,篮球,排球共20个,其总价值为330元.这三种球的价格分别是足球每个60元,篮球每个30元,排球每个10元,那么其中排球有______个.

答案

设有足球x个,篮球y个,排球z个

x+y+z=20 ①; 60x+30y+10z=330→6x+3y+z=33 ②

②-①得出,5x+2y=13

又∵x,y,z∈正整数,

∴x=1,那么y=4,由此可推出z=15

所以,排球有15个.

阅读理解

阅读理解。

     Bad days happen to us all. Often a day that starts out bad just continues to get worse. But why?

     Sometimes there's a "domino effect (多米诺骨牌效应)" with bad events. For example, you sleep

through the alarm, so you're stressed. And you will sit in the bad traffic, which will also make you late to

work, etc.

     How can we turn a bad day to a good day? Here are some ideas that have worked for me:

     Smile (微笑) a lot

     Smiling a lot will help you feel relaxed. Research has shown that smiling produces three useful

chemicals (化学物质) which make us feel good.

     Talk to a good friend

     Talk to someone who cares and listens really does help us feel better, too.

     Concentrate on your good things

     It's hard to concentrate on how bad things are when you're concentrating on how good things are!

Think of 10 or more things you're thankful for, and you'll achieve a whole new outlook (人生观) on

your day.

     Get some exercise

     If you can, go for a walk. Exercising will help you feel better. Exercising can get your day back to be

normal again.

     Make the day a challenge

     If you make yourself think of the day as a challenge, you'll start to do all the things you can to make

your day better.

1. According to the passage, the "domino effect" is an effect that                                  .

A. turns a good day to a bad day

B. makes one person affect another

C. turns bad things into good things

D. gets one event to cause other similar events to happen

2. Study shows that smiling produces three useful chemicals which make us feel                                  .

A. terrible    

B. relaxed  

C. stressed    

D. worried

3. According to the writer, if we consider a bad day as a challenge, we'll                                  .

A. try our best to do things    

B. give up doing things

C. lose all our confidence      

D. have a terrible day

4. How many ways does the writer give us to help us not to make a bad day stay bad?

A. 3.    

B. 4.    

C. 5.        

D. 6.

5. Which of the following can be the BEST title for the passage?

A. When we should smile a lot

B. How to deal with problems

C. How to turn a bad day around

D. What things we should concentrate on

单项选择题