2004年12月26日8时58分（北京时间），印度尼西亚苏门答腊岛西北近海（3．9°N，95．9°E）发送地震并引起海啸。结合下图，完成问题。

⑴Do you like pears?____             A. I can see twelve.

⑵Where are you from?____          B. No, I don't.

⑶How many cars can you see?____   C. He's my father.

⑷Is it on your desk?____             D. I'm from Canada.

⑸Who is that man?____              E. Yes, it is.

75°的圆心角所对的弧长是2.5πcm，则此弧所在圆的半径是（　　）