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问题 单项选择题

如图，转盘被分成了4部分，其中∠AOB=∠COD=90°，则随意转动转盘，指针指向∠AOB或∠COD所在区域的概率是多少（）

A．A

B．B

C．C

D．D

答案

参考答案：A

解析：

由于扇形，40B和扇形COD所占面积之和为圆面积的，故指针指向它们所在区域的概率就是。

完形填空

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选择题

两个数的□的个数是无限的。□里可以填[      ]

A．公倍数

B．公因数

C．最小公倍数
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