阅读理解
    When Dean Arnold got his first job, he was miserable (痛苦的), Each time he went to work, he coughed and he couldn't breathe. Working in a bakery(面包房) when you are allergic to (对…过敏) flour can be painful.
        But Arnold stayed with the National Biscuit Company for ten years. He was a businessman and he helped them improve production. At last his health problems became too serious. He left and formed his own company.
       With his wife and mother, he founded Arnold Bakery. They tried new recipes (配方). changing the kind and amount of flour used. This enabled Arnold to work there without too much pain. The bread, made with unbleached flour (标准粉), was baked in a brick oven (烘炉).
       They began by baking two dozen loaves(条). The bread was sold door to door for fifteen cents a loaf. Winning customers to his unusual, old-fashioned bread took time. But Arnold, struggling against his allergy, built his bakery into one of the largest in the United States.

神经细胞间可以通过一种特殊的介质来传递信息，含有传递分子的囊泡与神经细胞的质膜融合之后再打开，将传递分子释放到神经细胞外部．这属于（  ）

漫画《让人民监督权力，让权力在阳光下运行》所体现的监督最可能的是（    ）

在△ABC中，若|sinA﹣ $\frac{1}{2}$ |+（cosB﹣ $\frac{1}{2}$ ）²=0，则∠C的度数是____．

改善城市生态环境的举措，必须符合可持续发展的原则，否则会引发城市生态问题。读图，回答下列各题。