呼吸深快见于（）。

A.呼吸肌麻痹

B.过度紧张

C.严重鼓肠

D.大量腹水

E.肥胖

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