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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