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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单项选择题

Pigeons can carry messages for about ______.

A．two weeks
B．four weeks
C．two years
D．four years

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.