（Ⅰ）从这50名男生中按是否挑同桌采取分层抽样的方法抽取一个容量为5的样本，现从这5人中随机选取3人做深度采访，求这3名学生中至少有2名要挑同桌的概率；

（Ⅱ）根据以上2×2列联表，是否有95%以上的把握认为“性别与在选择座位时是否挑同桌”有关？

下面的临界值表供参考：

（参考公式： $K^2=\frac{n{\left(ad-bc\right)}^2}{\left(a+b\right)\left(c+d\right)\left(a+c\right)\left(b+d\right)}$ ，其中n=a+b+c+d）

（Ⅰ）若 $BE=1$ ，在折叠后的线段 $AD$ 上是否存在一点 $P$ ，且 $\stackrel{\rightharpoonup }{AP}=\lambda \stackrel{\rightharpoonup }{PD}$ ，使得 $CP//$ 平面 $ABEF$ ？若存在，求出 $\lambda$ 的值；若不存在，说明理由；

（Ⅱ）求三棱锥 $A-CDF$ 的体积的最大值.

下列句子中划线的词语使用不恰当的一项是（    ）

    My name's John．Today is my birthday．I'm nine．I like animals(动物)．I like pandas．They are funny．I like eating, too．I like fish and eggs．I have a birthday cake and many gifts．Let's eat the birthday cake，OK?

       Hearing live music is one of the most pleasurable experiences available to human being. The music sounds great, it feels great, and you get to watch the players as they play it. No matter what kind of music you love, try listening to it live.
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