题目

She enjoyed the excitement of her work. Money was not her only _____________. A . breakthrough B . performance C . career D . motivation 答案：D10．现代建筑的门窗架常用电解加工成的古铜色硬铝制造．取硬铝样品进行如下实验（每一步试剂均过量），由此可以推知硬铝的组成可能为（　　）A．Al、Mg、SiO2、ZnB．Al、Fe、Zn、NaC．Al、Na、Cu、FeD．Al、Cu、Mg、Si