题目

Andy has _______ for five years. Five years _________ a long time.              A. come back home, is         B. come back home, are              C. been at home, is            D. been at home, are 答案：C小林家中的桌面有一只金鱼缸，小平敲了一下桌子，鱼缸中的金鱼立即受到惊吓，鱼接收到声波的传播途径是（ ）A．空气…水B．桌子…水…鱼C．桌子…空气…水…鱼D．桌子…鱼缸…水…鱼