我国实施科教兴国战略的奠基工程是（    ）

阅读下面短文，根据短文内容回答问题。

    My name is Grace. Today is Sunday. It is a nice day. It is also my grandfather's birthday. He is 80 years old. My parents and I go to his home. We don't get up early because the alarm clock (闹钟) doesn't work. We don't have much time for breakfast. We go to a supermarket to buy some fruit and a birthday cake at eight thirty. Then we go to my grandparents' home quickly. We get there at 11:15. My grandparents are very happy to see us. We have lunch at 12 o'clock. After lunch, we play chess with my grandfather. It is interesting. We go home at about four o'clock in the afternoon. It is a happy day.

傅衣凌主编《中国历史·明史》载：从江南丝织业的整个生产过程看，一个机房中，机工有络工、拽工、织工、牵经工，还有刷边、运经、接头等工，各有专门技术……反映了明朝手工业（    ）

若平行四边形中两个内角的度数比为1：2，则其中较大的内角是　____ 度．