简要回答招投标的特点？
参考答案：
招投标的特点：
（1）公平、公开、公正的竞争机制。
（2）交易一次性完成。
（3）规范的操作程序。
By the end of last year, another new gymnasium _____ in Beijing.[ ]
A.would be completed
B. was being completed
C. had been completed
D. has been completed
癫痫的病因包括（）
A．顽痰内伏
B．暴受惊恐
C．惊风频发
D．外伤血瘀
E．元阴不足
