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AB＝CD,AD＝BC AB＝CD,AB∥CD AB＝CD,AD∥BC AB∥CD,AD∥BC
AB∥CD，AD=BC AB=AD，CB=CD AB=CD，AD=BC ∠B=∠C，∠A=∠D
AB∥CD，AD=BC ∠A.=∠ ，∠B.=∠DC.AB∥CD，AD∥BC AB=CD，AD=BC
∠D.=∠C，∠BAD=∠ABC ∠BAD=∠ABC，∠ABD=∠BAC BD=AC，∠BAD=∠ABC AD=BC，BD=AC
∠3=∠4 ∠A.+∠ADC=180° ∠1=∠2 ∠A.＝∠5
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
∠3=∠4 ∠A.+∠ADC=180° ∠1=∠2 ∠A.=∠5
AB∥CD，AD = BC； ∠B. = ∠ ；∠A. = ∠ ， C.AB =CD，CB = AD；D.AB = AD，CD = BC
∠BDC＝∠BCD ∠ABC＝∠DAB ∠ADB＝∠DAC ∠AOB＝∠BOC
AD=BC，AB∥CD AO=CO，AD=BC AD∥BC，∠ADC=∠ABC AD=BC，∠ABD=∠CDB
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
AB∥CD，AD=BC AB=AD，CB=CD AB=CD，AD=BC ∠B=∠C，∠A=∠D
AD•DB=AE•EC AD•AE=BD•EC AD•CE=AE•BD AD•BC=AB•DE
AB∥CD，AD=BC ∠B=∠C；∠A=∠D AB=AD，CB=CD AB=CD，AD=BC
，下列条件中，能推得DE∥BC的条件是（ ） 
A.AE：EC=AD：DB AD：AB=DE：BC AD：DE=AB：BC BD：AB=AC：EC
∠DAC=∠BCA ∠DCB+∠ABC=180° ∠ABD=∠BDC ∠BAC=∠ACD
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
AB//CD，AD=BC ∠A.=∠B.，∠ =∠ C.AB=AD，CB=CDD.AB=CD，AD=BC
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC 
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