佝偻病的后遗症有（）
A.“O”型腿
B.智力减退
C.鸡胸
D.扁平骨盆
E.颅骨软化
参考答案：A, C, D
I don’t think the experiment is ______ failure, because it has provided us with _____ valuable experience for our future tests.
A．不填; 不填
B．a; 不填
C．a ; a
D．不填; a
行政立法
