问题
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
答案
参考答案：C
解析：Since the pattern has six digits, divide 135 by 6. The quotient is 22 and the remainder is 3. Since 22 × 6 = 132, the 132nd number completes the pattern for the 22nd time. So the 133rd, 134th, and 135th numbers are Is, and the 136th and 137th are 2s; and their sum is 1+2+2=5,