单项选择题

The part of a computer that （） is the size of the end of a finger.

A．prints the information
B．stores the information
C．does the computing
D．memorizes computing

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单项选择题
The computations of the computer are measured in （）

A．seconds
B．microseconds
C．milliseconds
D．nanoseconds
单项选择题
When he traveled abroad, Mr. Smith （）

A．learned boxing
B．forgot all about his business
C．raised the level of production
D．shook his head all the time
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