单项选择题

Race horses are hard to train because they are ______.

A．faster than other horses
B．smaller than other horses
C．more suspicious than other horses
D．more nervous than other horses
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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
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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