供洗相用的硝酸银(AgN03)溶液

A. 白术
B. 玉竹
C. 党参
D. 山药
E. 白扁豆

A. 百合
B. 枸杞
C. 石斛
D. 麦门冬
E. 天门冬

A. Scientists have studied them for centuries.
B. They were meat eating as well as plant eating.
C. They wandered the earth for millions of years.
D. They lived on land, in the sea, and in the sky.

A. How many minority communities are mentioned in this speech a. Three. b. Four. c. Five. d. Two.