23．— What’s that terrible noise．David?

— Oh，I forgot to tell you．The new machines in the nearby plant _______．

A．were tested

B．will be tested

C．are being tested

D．have been tested

肺结核外科治疗的适应证是（）

A.初治的空洞型肺结核

B.24小时咯血超过600ml，内科治疗无效

C.结核性脓胸合并支气管胸膜瘘，对侧活动性肺结核

D.无症状结核瘤，化疗后无变化

E.毁损肺