The first part of the 20th century saw more great inventions.The helicopter in 1909.Movies with sound 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.The middle part of the 20th century brought new ways to help people get over disease.They worked very well.They made people healthier and let them live longer lives.By the 1960's most people could expect to live to be at least 60.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 was known to man but the stars were not.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 though.

　　New inventions will someday allow us to do things we have never yet dreamed of.

　　()31.Camera was invented after ________.

　　A．1850

　　B．1950

　　C．1800

　　D．1900

　　()2.Why did the world start to change in the early 1800's?

　　A．Because there were few inventions that had as much effect as the wheel for hundreds of years.

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