单选题 According to official government records, in Greenland the suicide rate (suicides per 1,000 people) was seventeen times greater in 1987 than in 1960. Because Greenland changed from a hunting and fishing society to an industrial society between 1960 and 1987, the dramatic increase in suicide must be a result of this societal change.
Which of the following, if true, casts the most serious doubt on the conclusion drawn above?

A、 The change from a hunting and fishing society to an industrial society sometimes causes a dramatic increase in a society"s crime rate
B、 Even in a hunting and fishing society, some proportion of the society"s members will choose to commit suicide
C、 According to official government records, most of those who committed suicide in Greenland in 1987 were male
D、 The life expectancy of Greenland"s inhabitants was not much greater in i987 than it was in 1960, before the societal change occurred
E、 In 1987 most suicides that occurred in Greenland were reported as suicides to the appropriate government office, whereas in 1960 most were not

【正确答案】 E

【答案解析】[解析] 本题的推理是由一个事实：“自杀率上升”，而得出一个解释性的结论：“社会变化是原因”，属于“B，A”题型，推理所依赖的假设是“除了A以外没有别的因素导致B”。若1987年自杀事件上报到了有关部门但1960年大多数自杀没有上报，如(E)所说，就表明完全有可能是因为上报率高而导致自杀率高了，反对了上面推理的隐含假设，也就反对了段落推理，所以(E)正确。(A)中的“Some times”说明不了任何问题；(B)中的“Some”也对推理起不到任何作用；(C)、(D)均为无关选项。