根据以下资料，回答下列各题： IDirections: The following is a list of terms used in economy．After reading it, you are required to find the items equivalent to (与 ...相同的) those given m Chinese in the table below．Then you hould put the corresponding letters in brackets on the Answer Sheet, numbered 51 to 55. A—socialist economy D—planned economy B—capitaiist economy E—controlled economy C—collective economy F—rural economy G—liberal economy 0—economic balance H—mixed economy P—econormic fluctuation I—political economics Q—economic depression J—protectionism R—economic stability K—primary sector S—economic policy L—private sector T—economic recovery M—public sector U—economic trend N—economic channels V— economic situation Examples：(S)经济政策 (D．计划经济 ( )经济平衡 ( )经济复原