单项选择题

A．They migrate from North America to the Falkland Islands.
B．They migrate only once during their lifetime.
C．They migrate using what is apparently an inborn navigational ability.
D．They migrate when they are freed from their cages.
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单项选择题
A．He needs to press F7 to return to the document before he prints it.B．He has to print the document to see the page numbers.C．The printer is not working correctly.D．The numbers are on the screen but they don’t print out.
A．He needs to press F7 to return to the document before he prints it.
B．He has to print the document to see the page numbers.
C．The printer is not working correctly.
D．The numbers are on the screen but they don’t print out.
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