Since its repair, the central heating system in the Rayburn Building is now in ( ) order.

A. working

B. practical

C. realistic

D. useful

【答案】A。词意判断。“雷本大厦的中央供暖系统经过修理，现在可以正常使用了”。In working order“处于正常运转状态”;practical“实际的、实用的”;realistic“现实的、逼真的”;useful“有用的、有益的”。