单项选择题

According to the author, the first computing machine was in use ______ years ago.

A．500
B．1,000
C．5,000
D．10,000
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单项选择题
In order to store and remember numbers people in earlier times might use all of the following to count with except ______.
A．stones or shells
B．human hands and fingers
C．seeds and beads
D．animals
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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