Recently,CCTV reporter have asked a simple question, "Are you happy?" The question has caught many interviewees off guard. Even Mo Yan, who recently won a Nobel Prize, answered by saying "I don't know." We should ask "What exactly is happiness? And how do you measure  it?". Last year, China's Premier Wen Jiabao told the nation, "Everything we do is aimed at letting people live more happily." At last year's National People's Congress , officials agreed that increasing happiness would be a top target  for the 12thfive-year plan. Many argue that happiness is _ . It also means different things to different people. For some, happiness can be as simple as having enough money to buy a new bicycle; for others, it's about socializing  or finding the perfect spouse . Chen Shangyuan, 21, a college student, said his idea of happiness always evolves . "At present it relates to how productive I am in a day", he said. "It might be linked to  job security   or leisure  time after I graduate." What did Mo Yan say when he was asked the question "Are you happy?"
Yes, I am very happy. No, I am not happy. It depends on the weather. I don't know