单项选择题

Pigeons can carry messages for about _____.

A．two weeks
B．four weeks
C．two years
D．four years
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单项选择题
Lions can be photographed easily when _____.
A．they are following a trail of something that smells good to them
B．they are returning to their families
C．they have been trained to work with other animals
D．they do not know a movie actor is nearby
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