请写出一个是中心对称图形的几何图形的名称：____．

    Jodie doesn't like her job. She is a ____. She____to work in the evening. She has to work on____. She is always busy. She doesn't want to work in a restaurant. It's boring.

    She wants to be an ____. She likes to sing and dance. She likes to work ____ other young people. She wants to be in the pop play. She wants to be known by many people.

    ____ now she can only work in the restaurant. She is very unhappy every day.____ can she do? Can you help her?____a letter to her soon.

正确地盖盖玻片是成功制作临时装片的关键。下图所示制作临时装片时盖盖玻片的操作，正确的是（  ）

A﹣H是初中化学常见的物质，其相互转化关系如图所示，其中A是人体胃液中帮助消化的物质，B是用于改良酸性土壤的碱．

按要求完成下列作图：

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（1）如图甲所示，AO是射向平面镜的一条入射光线，请画出反射光线OB．

（2）请根据图乙中光线通过透镜前后的方向，在虚线框内画出适当的透镜符号．