要把一个圆的周长扩大到它的4倍，半径应[ ]
A．扩大到它的2倍
B．扩大到它的4倍
C．扩大到它的8倍
答案：B
Pip ______ a gentleman and ______ Estella’s love, who is a beautiful girl.
A．is bent to becoming; winning
B．is bent on becoming; win
C．is determined to become; winning
D．is determined to become; win
奠定了我国儿童游戏研究基础的是（）
A.张雪门
B.陶行知
C.张宗麟
D.陈鹤琴
