单项选择题

The mail was delayed for two days because of the snow-storm.

A．held in
B．held up
C．held down
D．held off
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单项选择题
Practically all species of animals communicate either through sounds or through a large repertory of soundless codes.
A．Simultaneously
B．Almost
C．Absolutely
D．Basically
单项选择题
It is seldom acceptable to abbreviate words in formal writing.
A．omit
B．explain
C．invent
D．shorten
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