With the development of science and technology, our life has changed a lot, Many people have experienced the changes, And I _______ some people about it.

In the 1970s, black-and-white TV was hardly seen. If you has one, all the people in the village will go to _______ home to watch TV until late night. In the 1980s, we had a 21 inch TV, and it was in color. In the 1990s. much bigger TV entered every family, Now TV is _______ as big as a table. The image is getting a lot _______. Even the hair can be seen clearly.

In the 1970s. bikes caught people’s _______. “No one has seen traveling without _______. It’s so strange,” my father said. In the 1990s, motorcycles (摩托车) came into people’s life _______ it ran faster than bike. Almost every family is able to buy a car in the 21st century.

In the 1970s, letters were the only way for people to communicate with each other, and it took much time to _______ replies from others. In the 1990s, mobile phones began to appear in general families. But there are too many ways to communicate now, such as mobile phone, QQ and WeChat. People can even have a video chat _______ WeChat, which was impossible ten years ago.

We are ________ of scientific and technological progress. Our life has changed so much.

The Egyptian Pyramids (埃及金字塔) are really something special. They have a history of four to five thousand years. Every year millions of tourists from all over the world travel there.

It is said that many people want to experience the feeling of climbing to the top of the Pyramids. Unluckily, none of them can achieve it. According to the police records, since 1940, no one who climbed the Pyramids could come back alive, which is a great mystery of the Pyramids.

The gate of the Pyramid weighs about 20 tons. But the amazing thing is that you can push the door with one hand easily. It’s really unbelievable.

The Pyramids in Egypt also have much magic power: For example, when you have a headache, it will stop the pain if you sleep in the Pyramids; Vegetables or fruit can be kept for longer time in the Pyramids. So people think that there must be an energy that can’t be discovered in the Pyramids. But what could it be?

Another mystery of the Pyramids is that when we enter the Pyramids with electronic instruments, they won’t work well. It seems that something disturbs (打扰) them.

The Pyramids are magical, and everyone has a common question: How were they built? We haven’t known the answer yet.