A. ago B. named C. None D. those E. Without F. thank G. them H. small I. changed J. by K. early L. important |
In your schoolbags, most of you may have a pencil, some kinds of pens, a ruler and some books. of these things grow in the fields. They were all invented someone and made in factories. Thousands of years , no one knew about these things. Even the simple invention has the greatest technological advance（进步） at its time.
Who invented ? We don't always know. There have been hundreds of thousands of inventions, large or in human history. Some of these inventions have greatly the world, such as paper, printing and radios, and we are impressed by them. However, we have forgotten of the other inventions—for example, who invented the clock, or the lock to the door? We may not know. We should the inventors for their clever ideas. New ideas are . They can change our lives. inventions, we would still live in forests, with nothing to wear and no ice-cream to eat.
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