2、A;
3、A;
4、B;
5、B;
6 、( 1)≈2 =≈4(2)≈b+≈BAD = 180
7. It is known that the definition of the angular bisector is known that ∠3=∠2, the internal dislocation angles are equal and the two straight lines are parallel.
8、C;
9、A;
10, AB parallel CD is equal to the inside angle of the side, and the two straight lines are parallel.
It's too much trouble to fight in the back
Chapter I General Provisions
Article 1 In order to ensure the smooth enrollment of undergraduate and junior college students in henan university of econ