题目

–– ______ is it from your home to your school?   –– It’s about ten minutes’ walk. A. How far            B. How long            C. How often        D. How much 答案：A2．如图，平行四边形ABCD中，对角线AC、BD相交于点O，E、F是AC上的两点，当E、F满足下列哪个条件时，四边形DEBF不一定是平行四边形（　　）A．∠ADE=∠CBFB．∠ABE=∠CDFC．DE=BFD．OE=OF