ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.7.2 探究平行线的性质同步练习【基础演练】一、选择题1.一条公路两次转弯后又回到原来的方向(即 AB∥CD,如图 4.1-15),假如第一次转弯时的∠B=140°,那么,∠C 应是( )A.40°; B.100°; C.140°; D.180°.2.如图,一把矩形直尺沿直线断开并错位,点 E、D、B、F 在同一条直线上,若∠ADE=125°,则∠DBC 的度数为( )A.55°; B.65°; C.75°; D.125°.3.一架飞机向北飞行,两次改变方向后,前进的方向与原来的航行方向平行,已知第一次向左拐 50°,那么第二次向右拐( )A.40°; B.50°; C.130°; D.150°.4.如图,直线 c 与直线 a、b 相交,且 a//b,则下列结论:(1);(2);(3)中正确的个数为( )A.0; B.1; C.2; D.3.5.用 A、B、C 分别表示学校、小明家、小红家,已知学校在小明家的南偏东 25 ,小红家在小明家正东,小红家在学校北偏东 35 ,则∠BAC=( )A.35 ; B.55 ; C.60 ; D.65 .6.假如两条直线被第三条直线所截,那么一组内错角的平分线( )A.互相垂直; B.互相平行; C.互相重合; D.以上均不正确.7.如图已知∠1=∠2,∠BAD=∠BCD,则下列结论⑴AB∥CD,⑵ AD∥BC,⑶∠B=∠D,⑷∠D=∠ACB,正确的有( )A.1个; B.2个; C.3个; D.4个.8.如图,DE∥BC,EF∥AB,图中与∠BFE 互补的角共有( ) A.3 个; B.2 个; C.5 个; D.4 个.二、填空题9.如图,直线被直线所截,若,∠1=60°,则 .Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students...