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
Which of the following statements is NOT true
A．Elephants can be graceful.
B．Tigers are too dangerous to be trained.
C．Animals which are natural enemies can be trained to live together.
D．Animals can become interested in their tricks.
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