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.

　　B．Because there was little unknown land left in the world.

　　C．Because people did not have to explore much anymore.

　　D．Because people began to work to make life better instead of exploring unknown world.

　　()3.In Paragraph 2, the word “They” in the sentence “They worked very well” refers to ________.

　　A．helicopters, computers, jet planes, nylonB．new ways to help people get over disease

　　C．new materialsD．people

　　()4.Why did man have a desire to explore again?

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