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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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
单项选择题
The nursery is bright and cheerful.
A．pleasant
B．colorful
C．fashionable
D．unforgettable
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