单项选择题
A.1B.2C.3D.4
A.4B.5C.8D.10
A.19B.20C.21D.22
A.1B.1.1C.1.2D.1.3
A.1B.1.5C.2D.2.5
A.11B.12C.13D.14
A.49B.50C.51D.52
A.25B.27C.29D.30
A.35B.40C.45D.50
A.5B.6C.7D.8