根处于失水状态时,外界溶液浓度(W)与根细胞细胞液浓度(X)的关系是( )
下列长度的单位换算正确的是( )
Bob: What do you usually____ (do) on Sunday, Ann?
Ann: I usually____(go) to the library with my sister, Betty. But sometimes my grandfather____(go) with me. He____(like) reading very much.
下列叙述中,不是轴对称图形的是( )