问题 填空题

若将棱长分别为1cm、2cm、4cm、8cm的四个大小不同的正方体木块叠放在一起,然后用红色油漆去漆其表面(除它们之间的重叠部分不油漆,其他均要漆上),则油漆漆到的表面积最小为______cm2

答案

当四个正方体小的在上边,大的在下边顺次排列时油漆的表面积最小,

则油漆的面积:最大的正方体的表面积是:6×82=384cm2

上边的三个正方体的一个面的面积是:1cm2,4cm2,16cm2

则油漆漆到的表面积是:4×(1+4+16)+384=468cm2

故答案是:468.

阅读理解

New York City is a very large city with 8 million people. How do so many people move on their way to work and school?

In New York you can travel by subways, bus, taxi and private (私人的) car. The subway runs on the railroad lines under the city. It crosses the city at different points and goes to all parts of the city. Travelling by subway is the fastest way to get around the city.

The second way to travel is by bus. It is a slower way to travel.

You can also travel by taxi. This is very expensive, but the taxi will take you to every place you want to go to. If traffic is heavy, the taxi will be slow. During the mornings and afternoons, there is the “rush hour”. This is the time when the traffic is very heavy with people going to and from work..

The last way is to use your private car. It’s not good to drive during the “rush hour”. If there is an accident on the road, you will have to wait for a long time.

The best time to travel is from 9 a.m to 4.pm . Traffic will be less crowded during this time because most people are already at school or at work at that time.

小题1:How many ways of travelling are mentioned (提到) in the passage?

A.Two

B.Three

C.Four

D.Five小题2:The word “rush hour” in Chinese means _____________.

A.高峰时间.

B.匆忙时间

C.冲刺时间

D.繁忙时间小题3:The fastest way to travel in New York City is ________________.

A.by bus

B.by subway

C.by taxi

D.by private car小题4:From the last paragraph we know that in New York City ____________.

A.there is no “rush hour” from 9.am to 4 p.m.

B.traffic is heavy at noon.

C.most Americans have lunch at home.

D.people go to work and school at 9:00.小题5:Why do so many people go to work or school by subway, taxi, bus and private car?

A.Because New York City is a modern city.

B.Because New York City is a very large city.

C.Because New York City is new.

D.Because the people in New York City are very busy.

单项选择题