单项选择题
A.3∶1B.2∶1C.3∶2D.5∶2
A.39B.40C.41D.42
A.24B.27C.29D.33
A.1/8B.1/4C.3/2D.5/4
A.999/1010B.C.888/999D.101/99
A.1/3B.1/100C.3/10D.33/100
A.B.4400C.43300D.43299
A.74073092B.74074062C.74073396D.74007396
A.104705B.116704C.105029D.118027
A.1B.2C.3D.6
A.15504B.1900C.2000D.15554