党的十九大报告指出，坚持严管和厚爱结合、激励和约束并重，完善干部考核评价机制，建立激励和（）机制。
A.追责
B.反向激励
C.容错纠错
参考答案：C
— How come a simple meal like this costs so much?
— We have _______ in your bill the cost of the teapot you broke just now.[ ]
A. added
B. included
C. gained
D. contained
分类是学习化学的方法之一，下列物质按单质、盐、混合物的顺序排列的是（ ）
A．氧气、碳酸钙、空气
B．氢气、碳酸钠、水
C．生铁、食盐、冰水
D．金刚石、熟石灰、石油
