下列国家属于北欧的有（）
A.丹麦
B.芬兰
C.瑞典
D.荷兰
E.挪威
参考答案：A, B, C, E
— _____________ are you?
— I'm ten years old. [ ]
A. How many
B. How much
C. How old
D. How about
延迟遗传
