题目

____ the uprising, he returned to Italy. A.Learning from       B. Learning of       C. Learning by heart     D. Learning 答案：B7．如图，如果AB∥CD∥EF，那么下列结论正确的是（　　）A．$\frac{AC}{AE}$=$\frac{CD}{EF}$B．$\frac{AC}{BD}$=$\frac{CE}{DF}$C．$\frac{AC}{CE}$=$\frac{AB}{CD}$D．$\frac{AC}{DF}$=$\frac{BD}{CE}$