信号机按类型分为色灯信号机、臂板信号机和机车信号机。

  At the World Expo Shanghai 2010, you will be able to see the world in just one day.

The World Expo (short for “exposition”) is the third largest world event after the Olympics and the FIFA World Cup. Countries build pavilions(展示馆) at the Expo, showing off technologies and cultures with colorful exhibitions and performances.

People can experience the most advanced technologies at the World Expo. Throughout history, many new inventions have made their debuts(样品) at the World Expo, including the TV, telephone and even the ice cream cone.

But the Expo is not just a trade fair(商品交易会). It’s a platform(平台) for cultural exchange, bringing people closer to the rest of the world.

For example, at the Shanghai Expo, couples may be able to marry in French-style weddings at the France Pavilion. Thailand will let visitors walk into its emperor’s palace. Visitors to the Austria Pavilion will have the chance to experience the snow-capped mountains of the country.

Many countries have also decided to bring their national treasures to the event.

Since the 1993 Expo in Chicago, the World Expo began to focus on one theme. It changed from a show into a community event. Visitors are invited to help solve global issues, such as environmental problems.

The theme of the Shanghai Expo is “Better city, better life”. It will call on the world to solve the problems human beings face as a result of urbanization(城市化). In the future, more and more people may care about protecting the places they live in.

小题1:Countries build pavilions to show us ______ with colorful exhibitions and performances.

A．the Olympic games

B．the FIFA World Cup

C．technologies and cultures

D．many cities小题2:What’s the meaning of “cultural exchange” in this passage?

A．科技展示

B．文化交流

C．科技交流

D．自由买卖小题3: Which of the following is NOT true at the World Expo in this passage?

A．People can experience the most advanced technologies.

B．Couples may be able to marry in French-style weddings at the France Pavilion.

C．Visitors can walk into the emperor’s palace of Thailand.

D．Australia Pavilion will let the visitors experience the snow-capped mountains of the country.小题4:When did the World Expo begin to focus on one theme?

A．In 1990.

B．In 1993.

C．In 1998.

D．In 2010.小题5:What is the theme of the Shanghai Expo?

A．One world, one dream.

B．Better world, better life.

C．Better city, better life.

D．One world, one family.

阅读下列材料：  

材料1  

朝代      南方                           北方

人口（户） 占全国户口数比例    人口（户）     占全国户口数比例

西汉   2470685      19.8%                9985785       80.2%

唐代   3920415     43.2%                5148529       56.8%

北宋   11224760     62.9%               6624296       37.1%  

材料2 朝廷在故都（东京）时，实仰东南财赋，而吴（江苏）中又为东南根抵。语曰“苏常熟，天下足”。  

请回答：

（1）从材料上看我国古代经济发展出现了怎样的变化？（2分）

（2）南方经济发展原因是什么？（6分）

次要作用为内旋、内转的肌肉是()

A．内直肌

B．上斜肌

C．下直肌

D．上直肌

E．下斜肌

青色金是指什么？

人们说话时发出的语音信号必须经过数字化才能由计算机进行存储、处理和传输。语音信号的带宽为300～3400Hz，若取样频率为8kHz、量化精度为8位，则经过数字化之后每小时的数据量(未压缩时)大约是

A．230MB

B．115MB

C．461MB

D．29MB