《2025年百年学典快乐假期暑假作业八年级综合北师大版》

四、跨学科·数学 阅读理解
Long long ago, there was no zero. To write the number sixty - three, people wrote 63. 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(小圆点) to hold the space. Six hundred and three looked like 6·3. But the dot was hard to see. So people put a circle around it like 6⊙3. Then people could see the dot and remember the space. At last, only the circle around the dot was used. This is a story of how zero came to be used.
Now zero has many important uses. Zero tells how many. Can you tell some other ways of using zero?
(B)27. Long long ago, people didn’t know how to ______.
A. write
B. write zero
C. write numbers
D. write sixty - three
(B)28. Long long ago, people wrote ______ to show two hundred and eight.
A. 28 B. 2 8 C. 208 D. 228
(D)29. Later ______ was used to mean space.
A. not any B. letter “O”
C. zero D. a dot
(C)30. People used a circle ______.
A. to remember ways
B. to remember numbers
C. not to forget the dot
D. to mean nothing
(A)31. 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

答案： 27. B；28. B；29. D；30. C；31. A