It is Monday morning. Mary, Lucy, Tina and Judy____in the classroom.

    Mary says she loves____because she loves Christmas(圣诞节). She can have a____time with her family. And she doesn't like June.

    Lucy likes July____she likes the summer holiday(暑假). In July, her parents take____to travel(旅行). It's really great.

    Tina thinks the ____month is good. People can go out with____ and families. They can have a great ____together（一起）.

    Judy likes October because her birthday is on the tenth day in this ____. She usually has a good time on her____.

①土地改革 ②人民公社化

③农业合作社 ④家庭联产承包责任制       

若tan$\theta$+$\frac{1}{\tan \theta }$ =4,则sin2$\theta$=（    ）

与第一次工业革命相比，第二次工业革命在动力方面有何进步？分别指出两次工业革命在交通工具方面的新成果。