What does Paragraph 2 center on?

(单选题)（ ） (单选题)______ some people are motivated by a need for success, othe (单选题)Not until recently ______ the development of tourist-related (单选题)— I want to see Mr. White. We have an appointment.— I’m sorr (单选题)My eldest son, ______ work takes him all over the world, is (单选题)My room is a mess, but I ______ clean it before I go out ton (单选题)—Which classical Chinese poem do you like best?—Don’t laugh (单选题)—Looking back on ______ in years gone by and the good time t (单选题)—Have you read the novel the Call of the Wild by Jack London (单选题)The customers insisted that the product didn’t live up to th