Knowledge point 1. Internal dislocation angle 2. Equal position angle 3. Same side inner angle 4. 5 degrees. Parallel multiple choice questions 1. Two solutions of C 2 B. Because Angle 2= Angle 3 and Angle 1= Angle 2 and Angle 1= Angle 3, CE is parallel to FB, so Angle C= Angle 4, so Angle B=