閱讀理解：

　　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 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?

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：A
解析：

文章第一自然段講，古代沒有零的時(shí)代，人們?nèi)绾伪磉_(dá)含有零的數(shù)字；第二自然段講述人們?nèi)绾慰朔^去的不足，“put a circle around it like this 6⊙3”，最后演繹到今天的0的表達(dá)法。因此全文講述了0的發(fā)展及應(yīng)用。所以答案為A．


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