单项选择题

The last important idea mentioned in the passage is ______.

A．the invention of the abacus
B．the birth of a good computing machine
C．the idea of Zero
D．the idea of tens or hundreds
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单项选择题
Which of the following is a better title for the passage above ______
A．The Birth of Numbers
B．The Idea of Zero
C．The Use of the Abacus
D．Early Computing Ideas and Devices
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