单项选择题

A．Dangerous diseases.
B．Traffic accidents.
C．Too many children.
D．Few doctors and little medicine.
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单项选择题
A．He needs to press F -7 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 F -7 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.
单项选择题
Psychologists suggest eating a healthy diet to ward off loneliness.
A．Y
B．N
C．NG
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