单项选择题

With a total of 1,300 million people, China is one of the most densely _____ countries in the world.

A．populated
B．polluted
C．crowded
D．concentrated
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单项选择题
The poor old man was _____ yesterday when he was crossing the street.
A．run into
B．run out
C．run over
D．run through
单项选择题
Research is an active and formally organized search for _____ information for a specific purpose.
A．especial
B．particular
C．special
D．specific
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