题目

When the big bills for mother's hospital care came, father was glad he had money in the bank to _____.A. fall short of       B. fall through       C. fall back on       D. fall in with   答案：Cfall back on求助于；fall short of没达到，低于;fall in with与......一致，符合;同意，赞成，支持。fall through落空。本题译文：母亲在医院就医的各种帐单送来时，父亲高兴的是他可用银行里的存款来支付。14．如图，四边形ABCD中，∠A+∠C=180°，BD平分∠ABC，（1）求证：DC=AD；（2）若BC=21，AB=9，AD=10，求BD的长．