A:甲状腺
B:胃腺
C:肠腺
D:胰岛
如图, 山坡AC与水平面AB成30°的角,沿山坡AC每往上爬100米,则竖直高度上升( )米
When we practice_____English,we often end up___in Chinese.
—You . I'm not asking you for it.