答案:1A2D3B4A5A6D7D8D9B10C
11D12D13A14D15B16A17C18B19B20B
21A22E23B24A25C26E27B28B29B30D
31C32B33C34E35D36A37D38E39D/C40D
41B42A43D44E45A46D47D48E49C50C