***在答台湾记者问时说，“大陆和台湾是我们共同的家园，我们要把它一道维护好，建设好，使其花团锦簇，推进两岸关系和平发展，实现两岸花好月圆”。对此我们必须坚持的前提和政治基础是（    ）

    My name is Dave. I have three good friends, Jack, Tom and Jim. Jack likes cakes, Tom likes fruit, Jim likes eggs and I like vegetables. We all like hamburgers. We eat hamburgers for lunch every day. Jack and Tom like French fries , and I also(也) like French fries, but Jim doesn't like them. For dinner, I don't like chicken,    ⑶    Jack, Tom and Jim like it. They all think chicken is very delicious.

根据短文内容，回答下列问题。

若(2x)ⁿ－81＝(4x²＋9)(2x＋3)(2x－3)，则n的值是(   )

我国面积最大的省级行政单位的行政中心是（   ）