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

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

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问题 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?
选项 A、3
B、4
C、5
D、6
E、7
答案C
解析
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