We boated all morning. The river got narrower. At last it disappeared (消失). We saw a wall of white water 61 us. It was a large waterfall (瀑布). We 62 our way to a small beach (河滩) below the waterfall. It was very 63 work because the water ran so fast. Then we had to __64 the boat on our heads to the top of the fall. It took us two hours to push and pull all the way up the 65 of the waterfall. We stopped at the top and put down the 66 boat in a small pool (水潭). We drank some water and lay down, tired. Suddenly Alex shouted. "Where’s the boat? It is 67 ! " "There!" shouted Paddy. Then I saw it. It was almost at the top of the waterfall. We ran to catch it. We tried our best, but at the_____68__ minute we were so tired that we had to let the boat go. It flew down to the bottom (底部) of the waterfall.

61. A. behind B. over C. beside D. towards

62. A. made B. took C. found D. chose

63. A. easy B. different C. hard D. safe

64. A. put B. hold C. catch D. carry

65. A. middle B. side C. front D. top

66. A. heavy B. small C. light D. broken

67. A. coming B. gone C. left D. missed

68. A. next B. wrong C. first D. last

61.C 62.A 63.B 64.D 65.B 66.A 67.B
68.D