Long, long ago there was no zero. To write the number sixty-three people wrote 6 3. To write six hundred and three, people wrote 6 3. The space between six and three was there to mean." not any "tens. Sometimes people did not remember the space. It was hard to see and read.
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?
1.[单选题]Long, long ago people didn’t know how to ________.- A.write
- B.write zero
- C.write numbers
- D. write sixty-three
2.[单选题]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
3.[单选题]People used circles ________.- A.to remember ways
- B.to remember numbers
- C.not to forget the space
- D.to mean nothing
4.[单选题]Long, long ago if they wrote two hundred-eight, people wrote ________.- A.28.00
- B.2 8
- C.228.00
- D.208.00
5.[单选题]Later ________ was used to mean space.- A."not any"
- B. letter "0"
- C.zero
- D.a dot