单项选择题

Data is the plural form of ______ , it is rarely used.

A．number
B．datum
C．letter
D．date
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单项选择题
According to the information in the passage, the term general purpose computer, in literal translation ______ .
A．implies that many different types of computers
B．implies that many different types of divisions
C．implies that many different types of problems can be handled by the machine
D．implies that many different operators
单项选择题
Ellsworth laid his conclusion on ______ .
A．records of changes in his own intelligence
B．work with people in different climates
C．records of temperature change
D．all of the above
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