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。()