单项选择题

Life expectancy among adults 45 and 65 years of age by family income, sex, and race: United States, average annual 1979-89.

A sequence of numbers begins 1, 1, 1, 2, 2, 3 and then repeats this pattern forever. What is the sum of the 135th, 136th, and 137th numbers in the sequence？（）

A.3
B.4
C.5
D.6
E.7

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单项选择题
In the period from 1979-1989, on average, how much longer, in years, could a 45-year old Black man with a family income in excess of $25,000 expect to live than a 45-year old Black man with a family income of less than $10,000
A．4
B．6
C．8
D．10
E． 12
单项选择题
Paul drove m miles in h hours; Michelle drove the same distance in an hour less. How fast, in miles per hour, did Michelle drive（）

A.A
B.B
C.C
D.D
E.E
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