单项选择题
A.private goods and club goods
B.private goods and common resources
C.public goods and club goods
D.public goods and common resources
判断题 One way to treat the re-entry depression is to regard the travel as a way to learn how to live your daily life.（）
判断题 The “post-travel blue”means that after a trip you feel happier so that the sky looks blue.（）
单项选择题 Domestic oil（）and gasoline prices are two important issues in the presidential campaign.