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完形六 Gail and her dog, Sam, are standing at the street corner. Theyre waiting for the cars to go by. They want to go 41 the street. She is waiting for Sam to decide when they should cross. 42 blind people use special, trained( 受过训练的) dogs to help them tell when and where they would go. But not every dog can do 43 . A dog for the blind must be clever. The dog must be 44 at a special school. He is taught to walk 45 the trainers legs. He is taught to walk 46 his trainer does. The blind 47 goes to the school too. He practices with the dog. He holds the leather belt(皮带) around the dogs neck tightly(紧紧地). 48 he feels the dogs movements and knows when and where to 49 . At the street corner Sam doesnt watch the 50 Its not because hes careless. Its just because dogs cant 51 red lights from green ones. He is trained to watch the cars, and tell 52 the time is for him and Gail to cross. Sam is 53 to Gail.He does her seeing for her.He keeps her 54 danger. But Sam is not only Gails 55 . Hes her best friend, too. 41. A. through B. over C. across D. past 42. A. Any B. All C. No D. Some 43. A. one B. it C. these D. those 44. A. told B. asked C. trained D. helped 45. A. close to B. far from C. in front of D. behind 46. A. faster than B. slower than C. not so fast as D. as fast as | 
