题目

61. I went back home ____________(庆祝)my grandfather’s birthday last week. 62. People usually begin_________ (为...准备)the celebration a week before the festival. 63. I’m afraid I’ve__________(迷路).could you tell me where I am. 64. Does this road __________(通向)the Great Wall? 65. _________(在古代)，when the enemy came,soldiers would make fires or smoke to send alarm signals from here.如图所示，公路两侧的甲、乙两条水渠由路面下的倾斜涵洞相连，两渠水面相平．关于涵洞的水流方向，下列说法中正确的是（　　）A．由于水向低处流，所以涵洞中的水从乙流向甲B．由于甲侧涵洞口在水下位置较深，压强较大，所以涵洞中水从甲流向乙C．由于两渠水面相平，所以涵洞中的水不流动D．由于甲侧涵洞口的压强等于乙侧涵洞口的压强，所以涵洞中的水不流动