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
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单项选择题
It is seldom acceptable to abbreviate words in formal writing.
A．omit
B．explain
C．invent
D．shorten
单项选择题
All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
A．as result of
B．considering
C．on purpose
D．whatever
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