单选题 What is the least positive integer that is divisible by each of the integers 1 through 7, inclusive?
(A) 420 (B) 840
(C) 1,260 (D) 2,520
(E) 5,040

【正确答案】 A
【答案解析】[解析] 该题也即让考生求1,2,3,4,5,6和7这7个数的最小公倍数。根据最小公倍的求解公式可得其最小公倍数=22×3×5×7=21×20=420。