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Is it difficult to do the second model mathematics in Chongming senior high school entrance examination?
Because two straight lines are cut by a third straight line, the same angle is equal (indicating that the two straight lines are parallel).

Therefore, two straight lines are parallel and are internal angles to each other (basic theorem).

PS: I finished my paper in 20 minutes, and there is still more than an hour to kill time.

Also, you are from Zheng Da Middle School, and I am in Class 8, Grade 1.