与面积是12平方厘米的平行四边形等底等高的三角形的面积是(    )平方厘米。

近年来，纪录片《舌尖上的中国》引发全民关注美食的热潮，其中多次讲述了利用不同微生物的发酵作用制作的美味食品．请分析回答下列问题：

（1）在果醋制作时，运用醋酸菌在供应____ 和糖源充足时，将糖分解成醋酸；在糖源不充足时，也可以利用酒精生成醋酸，请写出该过程的化学反应式：____ ．

（2）腐乳制作的流程是：让豆腐上长出毛霉→加盐腌制→加卤汤装瓶→密封腌制．用盐腌制时，应注意控制____ ；配制卤汤时，要使卤汤中酒的含量控制在____ %左右．

（3）制作泡菜的原理是____ ．蔬菜在腌制过程中，会产生亚硝酸盐，在____条件下，亚硝酸盐与对氨基苯磺酸发生____反应后，与N﹣1﹣萘基乙二胺盐酸盐结合形成____色染料．

   It's Charlie's birthday today, but he isn't feeling happy. No one wishes him a happy birthday. Mother says nothing about his birthday. She just tells Charlie to play outside. At lunchtime, his mother calls, "Come in for lunch, Charlie!" Charlie slowly walks into his house. But the living room looks different. Charlie sees a big "Happy Birthday"banner(横幅). Then, he sees a birthday cake, balloons, presents, and all of his friends. "Happy birthday!" everyone shouts. Charlie’s face lights up. He is happy and surprised(吃惊). No one forgets his birthday after all!