单项选择题A plural society (in Para. 3) refers to a society where ______.
单项选择题Freight costs were reduced to 10% of what they had been because of ______.
单项选择题Which of the following statements is TRUE
单项选择题Why were passengers from Europe able to travel to New York so cheaply
单项选择题Which of the following can be the best title for the passage