The old man is from _____and he is a_____ teacher.
A:Chinese, China
B:Chinese, Chinese
C:China, Chinese
D:China, China
下列有关溶液的说法中,正确的是 ( )
比较形近字组词
诞____ 模____ 烦____ 饶____ 予____
延____ 摸____ 项____ 绕____ 于____
用配方法解方程x2+4x+1=0时,经过配方,得到( )