（Ⅰ）试评估该校高三年级男生在全市高中男生中的平均身高状况；

（Ⅱ）求这50名男生身高在172cm以上（含172cm）的人数；

（Ⅲ）在这50名男生身高在172cm以上（含172cm）的人中任意抽取2人，该2人中身高排名（从高到低）在全市前130名的人数记为ξ，求ξ的数学期望．

参考数据：若ξ﹣N（μ，σ²），则p（μ﹣σ＜ξ≤μ+σ）=0.6826，p（μ﹣2σ＜ξ≤μ+2σ）=0.9544，p（μ﹣3σ＜ξ≤μ+3σ）=0.9974．

①目前，在青少年中盛行网络语言，但这种语言终究不适宜正式        使用。

②新版《红楼梦》的定妆照刚一出炉，即遭遇了“连环雷”，尤其是对金陵十二钗的       ，更是“雷”声阵阵。

③“执政为民”还要求我们每一个国家工作人员能为百姓提供      便当的服务。

   What's a typical（典型的）day like in Buenos Aires（布宜诺斯艾利斯）? For Diego, who lives with his parents in a house in Buenos Aires, a school day starts 1. If his mother doesn't wake him up at 6:00 a.m., his dog Luna will. Diego 2 himself quickly and takes Luna for a walk.
   Then it's time to get ready for school. Diego puts on his school clothes and eats a quick 3. He slings（抛）his heavy schoolbag over his shoulder and gets onto the city bus for the 25 minutes’4 to school.Diego is in the seventh year of primary school. Classes start at 8:00 a.m. with math, followed5 history and music. At 1:00 p.m., Diego and his friends have their lunch. After lunch, Diego heads to English class. This is one of his favorites, 6 the students practise English by writing e-mails to students in 7 countries.
   When the 8 class ends, Diego and his friends 9 the bus to a city park to play football. Then he's back home to start on homework. If he finishes in time, Diego will cook dinner. His parents come home from work at about 8:00 p.m., and 10 they sit down to dinner. After dinner, Diego does some reading or watches TV before getting ready for bed!