问题 填空题

某超市规定:凡一次购买大米180kg以上可以按原价打折出售,购买180kg(包括180kg)以下只能按原价出售。小明家到超市买大米,原计划买的大米,只能按原价付款,需要500元;若多买40kg,则按打折价格付款,恰巧需要也是500元。

(1)则小明家原计划购买大米数量x(千克)的范围为(    );

(2)若按原价购买4kg与打折价购买5kg的款相同,那么原计划小明家购买(    )千克大米。

答案

(1)140<x≤180;(2)160

阅读理解

阅读理解。

     The weather is getting hotter. You are thirsty playing basketball or riding

home from school. A cold drink may be just the thing. But be careful what

you are drinking. Something that looks cool may not be good for your health. There are plenty of "energy(能量) drinks" on the market. Most of them have

beautiful colors and cool names. The lists on them tell you they are helpful to your health. Sounds great!

     But after a careful check you may find that most energy drinks have lots of caffeine (咖啡因) in them. These drinks are especially(尤其) aimed at(针对) young people, students, busy people and sports players. Makers sometimes

say their drinks make you better at sports and can keep you awake. But be

careful not to drink too much.

     Caffeine makes your heart beat(跳动) fast. Because of this, the

International Olympic Committee has limited( 限制) its use. Caffeine in

most energy drinks is at least as strong as that in a cup of coffee or tea.

Possible health dangers have something to do with energy drinks. Just one

box of energy drink can make you nervous, have difficulty sleeping and can

even cause heart problems. Scientists say that teenagers should be

discouraged from taking drinks with a lot of caffeine in them.

1. Many people like drinking energy drinks because of the following

EXCEPT that ________.

A. they have beautiful colors and cool names        

B. they have lots of caffeine

C. they can keep them awake and better at sports    

D. they are said to be helpful to health

2. The main reason for people not to drink too much energy drinks is that

they may cause ________.

A. heart problems    

B. nervousness  

C. sleeping difficulty  

D. possible health dangers

3. The underlined word "discouraged" can be replaced(替换) with "_____".

A. encouraged   

B. stopped  

C. helped   

D. disliked

4. From the passage we can know that _________.

A. advertisements are important in getting people to buy energy drinks

B. energy drinks are helpful to teenagers' study

C. sports players need to drink a lot of energy drinks

D. energy drinks are especially aimed at teenagers

5. Which of the following can be the best title(标题) of the passage?

A. What's the Use of Energy Drinks?    

B. Who Can Drink Energy Drinks      

C. What's That in Energy Drinks?  

D. Why Can't We Buy Energy Drink

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