According to the article, in the twenty-first cent

单项选择题

Exercise: You are going to hear a passage about the transportation in the 21st century. You will hear the passage only once. Now listen carefully and then tick the appropriate answer to each of the following questions.

According to the article, in the twenty-first century an American businessman will spend less than ______ to go to Paris.

A. three hours
B. four hours
C. five hours