大多数商品和服务价格实行( )
A．价格的机制B．价值规律C．市场调节价D．政府指导价或者政府定价E．明码标价
参考答案：C
射线的衰减与透过的物质厚度无关。
The boy is not particular about food and always eats ________ his parents give him.[ ]
A. no matter what
B. whichever
C. no matter which
D. whatever
