材料一:马克思说: “火药,罗盘针,印刷术——这是预兆资产阶级社会到来的三项伟大发明。火药把骑士炸得粉碎，罗盘针打开了世界市场并建立了殖民地, 而印刷术变成新教的工具,变成科学复兴的手段，变成制造精神发展的必要前提的最强大的推动力。”

材料二:“外国用火药制造子弹御敌，中国却用它作爆竹敬神；外国用罗盘针航海,中国却用它来看风水；外国用鸦片治病,中国却拿来当饭吃……”

——鲁迅

结合所学知识,请回答:

三年级二班共有学生48人，其中男同学占总人数的三分之二，女同学占总人数的几分之几？

根据下面的对话情景，在每个空白处填上—个适当的句子，使对话的意思连贯、完整。
A:I have a piece’ of good news to tell you , May?
B：Oh，____ ?
A: A new library has been open in our city, and there are many books there.
B: Really? ____ ?
A: It is open at 8:00 in the morning and closed at 6:00 in the afternoon.
B: ____ ?
A:  Yes, I went there yesterday
B: ____ ?
A: It’s in No. 7 building,  Center Street. ____ ?
B:Yes. I want to go there tomorrow.  Would you like to go with me?
A: Of course. Let’s meet at our school gate tomorrow.
B：OK. See you.
A: See you.