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按照1980年的调查,所有大于16岁的美国公民中10%是文盲。因此,如果预测在2000年有2.5亿大于16岁的美国公民,则将有2500万大于16岁的美国公民是文盲。
下面哪一个,如果正确,将削弱上面的结论?
A.在过去的20年中,高中毕业后未进入大学深造的学生比例稳步上升。
B.从1975年到1980年,文盲比例有3%的降低。
C.1980年调查时被调查的美国公民也将是2000年调查时的对象。
D.设计不合理的调查其结果是不准确的。

A.5亿大于16岁的美国公民,则将有2500万大于16岁的美国公民是文盲。
B.在过去的20年中,高中毕业后未进入大学深造的学生比例稳步上升。
B.从1975年到1980年,文盲比例有3%的降低。
C.1980年调查时被调查的美国公民也将是2000年调查时的对象。

【参考答案】

B
解析:因为1980年有10%是文盲,所以2000年有10%是文盲。显然这个结论要能成立,必须基于一个假设,文......

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