AB，M是EC上的点（不与端点重合），F为DA上的点，N为BE的中点．

（Ⅰ）若M是EC的中点，AF=3FD，求证：FN∥平面MBD；

（Ⅱ）若平面MBD与平面ABD所成角（锐角）的余弦值为 $\frac{1}{3}$ ，试确定点M在EC上的位置．

关于我国南方地区气候的叙述，正确的是（    ）

根据短文内容回答问题

Dear Mike，

      I'm so glad you're coming to China! Your mother，our foreign English teacher，told me you're worried about what you should and shouldn't do as a guest in China．Here's some advice．You will probably be invited to a big meal. You may find it earlier than you expect because Chinese people eat dinner much earlier than people in the West．There will be a lot of different dishes，not just three courses．You may find it difficult to use chopsticks if you haven't tried before．It's a good idea to get some practice．When the food is served，you should take time to look at it. The preparation takes a long time and everything will look beautiful．The plates will be placed in the middle of the table，for everyone to share．Take a little of everything and then have some more of the things you like．Chinese people like to talk about food，so it's a good topic of conversation．At the end of the meal，you will usually be served with fruit．Eat your fruit，thank your friends， and go．

      I hope this is helpful．E-mail me if you have any other questions． 

                                                                                                                              Yours，

                                                                                                                                   David Zhang

把下面的单词连成一句话。

马克思在《法兰西内战》一文中指出，“公社的真正秘密就在于：它实质上是工人阶级的政府，是生产者阶级同占有者阶级斗争的产物，是终于发现的可以使劳动在经济上获得解放的政治形式。”下列最能说明巴黎公社“实质上是工人阶级的政府”的是（  ）