Fair and(1)competition in govemment procurement around the world is good business and good public policy.Competitive pricing,product(2)and performance improvements result from competitive practices and help ensure that government authorities get the best(3)for the public they serve.

空白（1）为（）

A.open

B.continue

C.dependent

D.reliable

下列哪项不属于COPD的病理改变（）

A.慢性炎症导致小气管和细支气管气道壁损伤和修复过程反复循环发生

B.主要的病理表现为阻塞性肺气肿

C.病情轻时常发生于肺上部，严重时可弥散分布于全肺并有肺毛细血管床破坏

D.支气管有嗜酸性粒细胞，中性粒细胞，淋巴细胞浸润

E.COPD加重时，平滑肌增生，蛋白多糖和胶原的增多进一步使血管壁增厚