题目

Too many hotels have been built and this has _____ prices, making holidays cheaper. A. cut short      B. cut out      C. cut off       D. cut down   答案：Dcut short 缩短，打断；cut out 切断，删除，关掉；cut off切断，中断；cut down消减，砍到。由方程3x－2y－6＝0可得到用x表示y的式子是_________.