如图：

（1）已知AB∥CD，EF∥MN，∠1=115°，求∠2和∠4的度数；

（2）本题隐含着一个规律，请你根据（1）的结果进行归纳，试着用文字表述出来；

（3）利用（2）的结论解答：如果两个角的两边分别平行，其中一角是另一个角的两倍，求这两个角的大小．

①加入稍过量的Na₂CO₃溶液；

②加入稍过量的NaOH溶液；

③加入稍过量的BaCl₂溶液；

④滴入稀盐酸至无气泡产生；

⑤过滤．

—Sorry. I ________ to set my alarm clock.

    Our school is on Guangming Street. It's next to the People's Library. There is a park across from our school. The pay phone is between our school and a post office. Our school is very beautiful. There are many trees and flowers in it. If you want to come to our school from the airport, take a taxi and go down Center Avenue. You can see a big restaurant on your right. There is a bridge near the restaurant. Go across it and turn left. Then go down Bridge Street. Turn left at New Park and go down Guangming Street. Our school is across from a bank.

科学技术是生产力，事实证明这话讲得很对。依我看，科学技术是第一生产力。”人类历史上发生的三次科技革命的共同影响不包括（    ）