2. 职称英语
  3. Life expectancy among adults 45 and 65 years of age by family income, sex, and r

Life expectancy among adults 45 and 65 years of age by family income, sex, and r

游客2025-02-24  28
问题 Life expectancy among adults 45 and 65 years of age by family income, sex, and race: United States, average annual 1979-89
[br] 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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