发达国家最多的大洲是[ ]
A．大洋洲
B．南美洲
C．亚洲
D．欧洲
答案：D
— _________ do you have an Art Festival in your school? — Once a year.
A．How long
B．How often
C．How far
D．How soon
进出境动物临时隔离检疫场许可证4个月内有效。（）
