单项选择题
Stocks are regarded as a good long-term（）
A.involvement B.investment C.instrument D.installment
单项选择题 What's the（）difference between the two parties?
单项选择题 --Excuse me, how far is the airport from here? --（）
单项选择题 --I'm glad you like it. Please drop in any time you like. --（）
