--- The girl doesn’t like playing _______football. --- But she plays ______ piano well. A. the, / B. /, the C. a, the D. the, a 答案:B如图,在平面直角坐标系中,点A在x轴负半轴上,点B的坐标是(0,2),过点B作BC⊥AB交x轴于点C,过点C作CD⊥BC交y轴于点D,过点D作DE⊥CD交x轴于点E,过点E作EF⊥DE交y轴于点F,若EA=3AC.(1)求证:△CBA∽△EDC;(2)请写出点A,点C的坐标(解答过程可不写);(3)求出线段EF的长.