题目

—What's your phone number?—________ 3218-5596. A . It's B . Its C . Your phone is D . It 答案：A7．如果a×$\frac{5}{4}$=b×$\frac{4}{5}$（a、b都不为0），则（　　）A．a=bB．a＞bC．a＜b