摘要：①∠1=∠2是直线和被直线所截而成的角．②∠1=∠3是直线和被直线所截而成的角．③∠4=∠5是直线和被直线所截而成的角．④∠2=∠5是直线和被直线所截而成的角．

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如图所示，∠DCB和∠ABC是直线______和______被直线______所截而成的______角．

如图所示，∠DCB和∠ABC是直线和被直线所截而成的角．

如图所示，∠1和∠5是直线________、________被直线________所截而成的________角；∠2和∠3是直线________、________被直线________所截而成的________角；∠6和∠9是直线________、________被直线________所截而成的________角；∠ABC与∠DCB是直线________、________被直线________所截而成的________角．