问题 计算题

我国研究生产了一种高效电子节能灯,一只11W的这种灯照明亮度相当于60W的白炽灯,如果把5000万只60W的白炽灯都换成这种灯,按每灯每天使用3h计算,一年可节电多少度?

答案

解:W=Pt=(60-11)×10-3×3×365×5000×104(KWh)=26.8亿度。

阅读理解

阅读理解。

Dear David,

     How are you? I'm fine. I'm in London, at the International School of English. I'm in Class 3 with eight

other students. They're from different countries---Spain, America, and Thailand. Our teacher' s name is

Henry. He's very nice. He's a very good teacher.

     I'm living with an English family. Mr and Mrs Brown have three children. Tom is fourteen, Kate is twelve,

and Andrew is seven. They are all very friendly, but it isn't easy to understand them.

     London is very big and interesting. The weather is good---cold but sunny---and the parks are beautiful!

Hyde Park, and Green Park are all in the city center. English food is OK, but the coffee is very bad!

     Write to me soon. 

                                                                                                                                             Truly,

                                                                                                                                             Paula

1. From the letter we know there are _____ students in Paula's class.

A. seven

B. eight

C. nine

D. ten

2. The students are studying _____ in the school.

A. Chinese

B. Japanese

C. French

D. English

3. Paula has a very good teacher. His name is _____.

A. Kate

B. Andrew

C. Brown

D. Henry

4. There are three children in the English family and _____ is the youngest one.

A. Kate

B. Tom

C. Andrew

D. Peter

5. Which one is NOT right?

A. There are two parks in London.

B. The weather is cold but fine in London.

C. Paula doesn't like the coffee.

D. Paula is living with an English family.

单项选择题