圆周率π是一个______小数．
圆周率π是一个无限不循环小数，π=3.141592653…．
故答案为：无限不循环．
-You've given us a wonderful Chinese dinner, Mrs. Wang.
-- ______.
A．Oh, I'm afraid I didn't cook very well
B．I' m glad you enjoyed it
C．Come again when you are free
D．It's not necessary for you to say so
特许经营起源于：( )。
A．英国 B．美国 C．日本 D．意大利
