【单选题】Based on Question 4, for Helen, the opportunity cost of 1 dress is
【单选题】Question 2 is based on the news report you have just heard.
A.
It crawled over the woman’s hands
B.
It wound up on the steering wheel.
C.
It was killed by the police on the spot.
D.
It was covered with large scales.
【多选题】20世纪初,世界上最著名的三大旅行代理公司是( )
【单选题】20世纪初,世界上最著名的三大旅行代理公司是托马斯.库克公司和( )。