单项选择题

Generally speaking，the air pollution in cities is more serious thanin the country.

A． ones
B．one
C．that
D．those
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单项选择题
China is planning to buildnew station inSouth Pole for scientific research in 5—15 years time.
A． the；the
B． a；the
C．the；不填
D．a；不填
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