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解析:B．
The trick is tofactor all the numbers into primes：2，3，2 × 2，5，2 × 3，7， 2×2×2，3 × 3，2×5．Thesmallest multiple will need to have enough copies of each prime to cover all ofthese：2×2×2×3 × 3×5×7=2．520．
The trick is tofactor all the numbers into primes：2，3，2 × 2，5，2 × 3，7， 2×2×2，3 × 3，2×5．Thesmallest multiple will need to have enough copies of each prime to cover all ofthese：2×2×2×3 × 3×5×7=2．520．
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