There have been many great inventions, things that changed the way we live. The first great invention was one that is still very important today -the wheel. This made it easier to carry heavy things and to travel a long distance.
For hundreds of years after that there were few inventions that had as much effect (作用) as the wheel. Then in the early 1800's the word started to change. There was little unknown land left in the world. People didn't have to explore（探索） much anymore. They began to work hard to make life better. In the second half of the 19th century many great inventions were made. Among them were the camera, the electric light and the radio. These all became a big part of our life today. The first part of the 20th century saw more great inventions. The helicopter (直升飞机) in 1909. Sound movies in 1926. The computer in 1928. And jet planes in 1930. This was also a time when a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wear.
By this time most people had a very good life. Of course new inventions continued to be made. But man now had a desire to explore again. The world is known to man but the stars are not yet. Man began looking for ways to go into space. Russia made the first step. Then the United States took a step. Since then other countries, including China and Japan, have made their steps into space.
In 1969 man took his biggest step away from the earth. Americans first walked on the moon. This is certainly just a beginning thought. New inventions will some day allow us to do things we have never yet dreamed of.
This passage talks mainly about ___________.

A．why cars were very important

B．when light was invented

C．which country made the first step into space

D．how inventions effect people’s life

Nylon came out nearly at the same time as__________.

A．radio

B．camera

C．jet plane

D．movies

Which of the statement is not true?

A．For hundreds of years after wheel there were many other inventions having as much effect as the wheel.

B．America, Russia, Japan and China began to explore the stars before 1969.

C．In the early 1800’s people began to work instead of exploring more unknown land to make life better.

D．New invention will change our life greatly in the future.

What does “a desire” mean in the passage?

A．a good way	B．a new invention
C．a strong wish	D．a wonderful idea

Man didn’t have a desire to explore a lot ______________.

A．at the beginning of the 1800’s

B．in the 1960’s

C．since the 1900’s

D．from the 1800’s to the 1960’s