阿拉伯半岛初步统一与我国哪个历史时期大致同时 [ ]
A．秦朝
B．汉朝
C．唐朝
D．宋朝
答案：C
The old man has run four laps(圈) around the pool, while the younger one was almost after
only one lap.[ ]
A. breathless
B. priceless
C. careless
D. needless
对缺氧耐受最低的是（）
A.肺
B.肾脏
C.心肌
D.大脑皮质
E.肝脏
