男性，67岁。咳嗽、痰血2周，伴低热来院门诊。体检：一般情况可，浅表淋巴结不大，右上肺呼吸音降低。心（-），轻度杵状指。胸部平片示右上叶前段阻塞性肺炎。（）

A.肺门体层摄片

B.气管体层摄片

C.病灶体层摄片

D.支气管体层摄片

E.侧后倾斜体层摄片

Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide. ()

A. Devices

B. Hypotheses

C. Efforts

D. Suggestions