2009 AMC 8 第 4 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
4.
下面显示的五块拼片可以拼成下方五个图形中的四个。哪一个图形不能拼成？
The five pieces shown below can be arranged to form four of the five figures below. Which figure cannot be formed?
答案：B
小提示：
找出这五块拼片中必须出现在最终图形里的一个特征
Look for a feature in the five pieces that must appear in the final figure.
大提示：
那块长 个小方格的拼片必须能作为一段连续部分放进去
The long -square piece must fit as an unbroken segment somewhere.
解答：
注意选项 B 中没有任何长 个方格的连续线段。这说明那块长 个方格的拼片无法放入该图形。
所以正确答案是 B。
Note that option B does not have any segments in it that are blocks long. This means that it is impossible to arrange the block long piece to fit within the figure.
Thus, B is the correct answer.
其他年份的第 4 题
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