What is the passage mainly about?

(单选题)Which of the following is true of second language learning? (单选题)One of the unanswered questions of September 11th is whether (单选题)We may look at the world around us but somehow, we manage no (单选题)The theatre turned out to be ______ so few people go there; (单选题)There is something amazing in the Chinese that has stayed un (单选题)It’s strongly advised that smokers not be allowed to smoke i (单选题)Many parents receive a message about the class ______ becaus (单选题)In China the most ______ Spring Festival custom is making du (单选题)For the final ______ of our journey, we decided to take the (单选题)—I want to hire another manager for my company.—______, you’