【正确答案】：
CHINA'S SOCIAL SECURITY UNDERTAKINGS AND ITS SOCIAL TRANSFER PAYMENTS ARE OBVIOUSLY LAGGING BEHIND THE DEVELOPMENT OF ITS NATIONAL ECONOMY.
【题目解析】：China's social security undertakings and its social transfer payments are obviously lagging behind the development of its national economy.（考点：China's social security undertakings：中国的社会保障事业； social transfer payments：社会转移支付,；lag behind：滞后于。注意专业词汇的翻译和介词behind的应用。）