单项选择题

A．About half a million.
B．More than a million.
C．More than two million.
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单项选择题
A．Heart disease. B．Diabetes. C．Cancer.
A．Heart disease.
B．Diabetes.
C．Cancer.
单项选择题
A．Sherron Watkins. B．Coleen Rowley. C．Cynthia Cooper.
A．Sherron Watkins.
B．Coleen Rowley.
C．Cynthia Cooper.
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