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单选题
The diffserv approach to providing QoS in networks employs a small,well-defined set of building blocks from which you can build a variety of(________).Its aim is to define the differentiated services(DS)byte,the Type of Service(ToS)byte from the Internet Protocol Version 4( )and the Traffic Class byte from IP Version 6,and mark the standardized DS byte of the packet such that it receives a particular forwarding treatment,or per- hop behavior(PHB),at each network node.The diffserv architecture provides a( )within which service providers can offer customers a range of network services,each differentiated based on performance.A customer can choose the( )level needed on a packet-by-packet basis by simply marking the packet's Differentiated Services Code Point(DSCP)field to a specific value.This ( ) specifies the PHB given to the packet within the service provider network。横线处应选（ ）
A
B
C
D
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答案：
解析：
根据题目描述，The diffserv approach to providing QoS in networks employs a small，well-defined set of building blocks from which you can build a variety of “services”。这句话明确指出了差分服务方法用于在网络中提供QoS 是基于一组小的、定义良好的构建块来构建各种服务的。因此，第一个空格应该填入“services”，表示服务。其他选项如 networks、Users 和 structures 在文中并未明确提及与差分服务方法的直接关系。因此正确答案为 A。
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