题目

 I did my homework very __      ____, so my father looked ___      ___. A. careless, angry             B. carelessly, angrily C. carelessly, angry           D. careless, angrily 答案：C12．解下列方程组．（1）$\left\{\begin{array}{l}{x+2y=4}\\{2x-3y=1}\end{array}\right.$                   　  （2）$\left\{\begin{array}{l}{x+4y=14}\\{\frac{x-3}{4}-\frac{y-3}{3}=\frac{1}{12}}\end{array}\right.$．