单项选择题

The computations of the computer are measured in （）

A．seconds
B．microseconds
C．milliseconds
D．nanoseconds

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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
单项选择题
Mr. Smith went to see his doctor because he （）

A．had little to eat
B．was seriously ill
C．had to sleep
D．didn' t feel well
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