John Smith has a blog at The Lonely Planet Times, and you can listen to a live audio stream by clicking this link below.

A. steam
B. water flow
C. recording

D. programming

叶面狭窄、有茸毛、卷叶、气孔下陷、有蜡质层、机械组织友达寺，这些植物具有______的形态结构。