单项选择题

It is essential to have an alphabetical index with any numerical system. This involves more work in setting up the system and maintaining it（）.

A．signing
B．marking
C．layering
D．keeping it in good order

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单项选择题
Whom should a secretary inform before a meeting（） .

A．All those authorized to participate
B．Presents and participants
C．The participants who have titles
D．None
单项选择题
Paul and John are friendly with each other（）.

A．get by with
B．get along with
C．get over with
D．get through with
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