出版物发行企业的质量保证活动包括哪三个方面？
参考答案：
⑴思想保证。⑵制度保证。⑶服务保证。
一个细分市场如果是规模足够大，增长潜力好，竞争结构具有吸引力，一定就是企业必须选定的目标市场。
Although she is pretending hard to be young, grey hair and the lines on her face _______.
A．give her away
B．pick her up
C．take her away
D．hold her up
