Beijing, ______for hosting the 2008 Olympic Games, ____its first loop (圈) of green belt around the downtown, ____an area of 102.3 square kilometers, in the past three years.

A．prepared; built; covered

B．preparing; built; and covered

C．which prepares; building; covers

D．preparing; built; covering

下列行为，能够体现建设项目技术比选的可靠性原则的是（）。

A．采用比国内现有生产工艺先进的技术

B．不冒险采用未经中间试验就转化为生产的技术

C．充分发挥我国和项目所在地的资源优势

D．选择有利于环境保护和尽量少排放“三废”的技术