单项选择题

Pigeons have been used as messengers because ______.

A．they have a built-in compass
B．they can cover 500 miles in a single day
C．they have special ability to tell directions
D．they can find their way home

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单项选择题

Which is not true according to his passage

A．Scientists know the answer to the question how a pigeon tells direction.
B．Scientists are trying to answer the question how a pigeon finds its way home.
C．A pigeon can use some special way to sense where its home is.
D．By using the sun a pigeon can tell directions, rain or shine.

单项选择题

Which statement is true according to this passage

A．Two men came to the CYDF twice and donated 5,000 yuan to this organization for its development.
B．Deng Xiaoping donated 5,000 yuan in 1992 to Baise, Guangxi to aid children unable to go to the school.
C．The second time when the two came the CYDF they said donated the money on behalf of a veteran Communist Party member--Deng Xiaoping.
D．With the money Deng donated, twenty-five pupils in Baise were able to go to school.

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