你会进行负数运算吗?你会解一元二次方程吗?你知道这些运算方法最早记载在哪部著作中吗[ ]
A.《九章算术》
B.《周髀算经》
C.《伤寒杂病论》
D.《算数书》
答案:A
---My mother is ill in hospital. I have to look after her this afternoon.
---________.[ ]
A. That's all right
B. That's true
C. All right
D. I'm sorry to hear that
早、中期食管癌常用的手术方法是()
A.食管癌切除,结肠食管重建术
B.食管胃转流术
C.食管癌切除,胃食管重建术
D.食管癌切除,空肠食管重建术
E.食管癌切除,胃咽底吻合