单项选择题

（） is a sequence of letters and digits,the first character mustbe a letter.

A．An identifier
B．A string
C．An array
D．program

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单项选择题
Which of the following statements describe(s)the properties of a purely segmented memory system? （） Ⅰ．It suffers from internal fragmentation Ⅱ．It permits implementation of virtual memory Ⅲ．It divides memory into units of equal size

A．Ⅰ only
B．Ⅲ only
C．Ⅱ only
D．Ⅰand Ⅲ
单项选择题
Applications put computers to practical business （）

A．used
B．use
C．apply
D．applied
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