Later people used a dot to hold the space. Six hundred and three looked like this 6.3.But the dot was hard to see. So people put a circle around it like this 6⊙3.Then people could see the dot. They remembered the space. at last ,only the circle around the dot was used. It was like a zero. This is one story of how the zero came to be used.
Now zero has many important uses .Zero tells how many. Can you tell some other ways of using zero?
66.Long,long ago people didn`t know how to ____.
A.write B write zero C.write numbers D.sixty-three
67.Long,longago if they wrote two hundred-eight ,people wrote_____.
A.28 B.2 8 C.228 D.208
68.Later ______ was used to mean space.
A.not any B.letter0 C.zero D.a dot
69.People used circles _____________.
A.to remember ways B.to remember numbers
C.not to forget the space D.to mean nothing
70.The story tells us _____.
A. how zero came to be used
B. how to write zero
C. what`s the use of zero
D. that zero means a dot, a circle or space
C
I often dreamed about Pisa when I was a boy. I read about the famous building called the Leaning Tower of Pisa .But when I read the word Pisa, I was thinking of pizza .I thought this tower was a place to buy pizza .It must be the best place to buy pizza in the world, I thought.
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