（2015•枣庄）下列各式，计算正确的是（　　）

下列材料属于无机非金属材料的是（　　）

请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

(1) Although the film____  was not interesting, Ann played the lead role very well.

(2)It was ____ for my father to talk so much at table that day. He is always quiet.
(3)Visitors can watch all kinds of birds ____  at Beijing Wildlife Park.
(4)Mr Black was a very good swimmer in his ____ .
(5)The other team played even ____ in the second half of the basketball final.

“对坚守几个城市的孤军，先行‘分割包围’，之后采取‘先打两头，后取中间’的战术，依次解放被包围的城市。”以上内容是对哪次战役战术特点的描述(    )