解析：What is the proportion of giving bi_考试试题_专四专八

【单选题】What is the proportion of giving birth to a triplet
A、1 in 1,500,000.
B．1 in 15,000,000.
C．1 in 150,000,000.
D．1 in 1,500,000,000.

网考网参考答案：B
网考网解析：
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