单选题
What social scientists have long felt puzzled about?
A、
The mortality rate can not be predicted.
B、
The death toll remained stable year after year.
C、
A quota for each type of death has not come into being.
D、
People lost their lives every year for this or that reason.
【正确答案】
B
【答案解析】
[解析] 本题的依据是第一段最后一句It just happens that they follow a consistent pattern year after year，与选项B“死亡人数年复一年保持稳定”相吻合。
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