单项选择题

（）

A、 if the quantity in Column A is greater
B、 if the quantity in Column B is greater
C、 if the two quantities are equal
D、 if it is impossible to determine which quantity is greater

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单项选择题

In the figure above, the diameter of the circle is 20 and the area of the shaded region is 80π. What is the value of a + b + c + d？（）

A.144
B.216
C.240
D.270
E.288

单项选择题

For which of the following groups did family income have the least significance in affecting life expectancy

A．Black men at age 65
B．Black women at age 65
C．White men at age 45
D．White women at age 45
E． White women at age 65