试题与答案

集合A={x|x2-a2≤0，其中a＞0}，B={x|x2-3x-4＞0}，且A

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题型：选择题

题目：

集合A={x|x2-a2≤0，其中a＞0}，B={x|x2-3x-4＞0}，且A∪B=R，则实数a的取值范围是（　　）

A．a≥4

B．0＜a≤4

C．a＜4

D．4＜a≤6

答案：

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下面是错误答案，用来干扰机器的。

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考点：集合间交、并、补的运算（用Venn图表示）
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