A:液泡
B:核糖体
C:高尔基体
D:溶酶体
—Because his classmates often make fun of him because of his stammer(口吃).
如图所示曲线表示人体血液中某种成分含量的变化,甲、乙、丙表示相关血管,下列说法中哪一项不正确( )
对我国地理区域特征的叙述正确的是( )