2011年3月25日，国务院办公厅印发《2011年食品安全重点工作安排》，充分说明了国务院对保障人民群众饮食安全的高度重视和对食品安全工作常抓不懈的决心．下列食品加工方法对人体无害的是（　　）

①用福尔马林浸泡海鲜防止鱼虾变质  ②香肠中加大量亚硝酸钠以保持肉类新鲜

③用“牛肉膏”将猪肉加工成牛肉        ④用“瘦肉精”（一种含激素的饲料）喂养生猪

⑤用小苏打做发酵粉制面包              ⑥向乳制品添加三聚氰胺以提高含氮量．

A．②⑤

B．⑤

C．②③⑤

D．①②③④⑤⑥

Extreme Programming (XP) is a discipline of software development with(1)of simplicity,communication, feedback and courage.Successful software development is a team effort-not just the development team, but the larger team consisting of customer, management and developers. XP is a simple process that brings these people together and helps them to succeed together. XP is aimed primarily at object-oriented projects using teams of a dozen or fewer programmers in one location. The principles of XP apply to any(2)project that needs to deliver quality software rapidly and flexibly. 　　

An XP project needs a(an)(3)customer to provide guidance.Customers, programmers, managers, are all working(4)to build the system that's needeD. Customers-those who have software that needs to be developed-will leam simple, effective ways to(5)what they need, to be sure that they are getting what they need, and to steer the project to success.

空白（3）处应选择（）

A.part-time

B.casual

C.seldom

D.full-time