三角片形端生牙
A.鱼纲 B.两栖纲 C.爬行纲 D.鸟纲 E.哺乳纲
参考答案:A
下列哪项解剖结构不属于锥体外系统()
A.纹状体
B.黑质
C.内囊
D.红核
E.丘脑底核
Our school is having a sports meeting. Someone ______ here already.
A. arrived B. have arrived C. has arrived