单项选择题

The discovery of the halftone process in photography in 1881 made it ______ photographs in books and newspapers.

A．the possible reproduction
B．the possibility of reproducing
C．possible to reproduce
D．possibly reproduced
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单项选择题
The man was detained by the police at the airport because his passport was found to be ______.
A．an artificial one
B．an unnatural one
C．an untrue one
D．a false one
单项选择题
The problem has been ______ my mind all day.
A．preying on
B．getting at
C．taking on
D．seeing to
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