— What did you {#blank#}1{#/blank#} (看见) there?

— I saw interesting {#blank#}2{#/blank#} (汽车).

    Last Sunday, Mike and John visited some museums. They went to the car museum, the science museum and the insect museum. They saw many cars at the car museum. The cars were very beautiful and interesting. They took many pictures of the cars. They visited “The World of Robots” at the science museum. They saw many kinds of robots. There was a robot at the piano. He could play songs. Then they saw a robot dancer. He could move his head and arms. At last, they went to the insect museum. It was big. They also took many pictures of insects. They had a good time.

    一It's       the second floor．

Paper-making, compass, gunpowder (火药) and printing (印刷术) are the Four Great Inventions of ancient China.

In the Western Han Dynasty (朝代), people know how to make paper. In the Eastern Han Dynasty, Cai Lun uses tree bark, old cloth, and fishnets to make paper. These things are easy to find and cheap. Since then, more people can use paper.

Compass is also called Sinan. It is invented in China during the Han Dynasty. The spoon on the compass always points (指) to the south. It helps travelers to find their way.

Gunpowder is invented in China during the Tang Dynasty. It is a mixture of sulfur, charcoal, and saltpeter. At first, it is used in fireworks. Then people use it in cannons and guns.

Printing is invented in China during the Song Dynasty. It uses small blocks to create printed pages. So people can print books faster. After that, more people can read books and learn new things.