“就在戈尔巴乔夫交出核按钮的一瞬间,聚集在电视机前的人……都知道这是那座耸立了69年的红色帝国大厦在忽然间彻底倒塌了,从此被分裂为15块碎片。”材料所反映的历史事件是（   ）

A. —Is Ann reading a book? —No, she isn't. She's making a sandcastle.

B. Look at Tom. He is walking (走路）on the beach. He is very hot.

C. —Are the children collecting shells on the beach?—Yes, they are.

D. Look at John and Lily. They are flying kites in the park. They are happy.

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一个点到圆的最小距离为3cm，最大距离为8cm，则该圆的半径是（　　）

猴子属于(    )