菱形的周长为8cm，高为1cm，则该菱形两邻角度数比为[ ]
A.1：2
B.1：4
C.1：5
D.1：6
答案：C
蚀刻技术可分为（）和干蚀刻两类。
The latest edition of Harry Porter has been a best-seller for 3 weeks_______. [ ]
A. in a row
B. in the end
C. in turn
D. in advance
