下列对封建科举制度逐级考试排序正确的一项是[ ]
A.会试→院试→乡试→殿试
B.会试→殿试→乡试→院试
C.院试→乡试→殿试→会试
D.院试→乡试→会试→殿试
答案:D
“It’s $500, but that is my last offer.” “OK, it is a ________.”
A.cost
B.price
C.reward
D.deal
.已知方程(a-x)2-4(b-x)(c-x)=0,试说明:
(1)此方程必有实数根;
(2)若a、b、c为△ABC的三边长,方程有两个相等的实数根,则△ABC为等边三角形。