A:氯化钾的水溶液
B:液态氯化氢
C:气态甲烷
D:作电极的碳棒
You're kind.
Lucy likes English very much . She does her best _____it well.
水螅
____
A身体柔软,常包有贝壳
河蚌
B身体分节,无附肢
蚯蚓
C由两层细胞组成,身体辐射对称
蝗虫
D身体分节,附肢分节