（）邮件可以使用贴票方式收取邮费。
A.国际小包
B.普通包裹
C.快递包裹
D.挂号信函
参考答案：A, B, D
Owen wouldn't eat anything _____ he cooked it himself. [ ]
A. until
B. since
C. unless
D. while
政府为什么要对旅游业发展进行干预？
