阅读理解。 Little Tom down the street calls our dog 'the keep dog'. Zip is a sheep dog. But when Tom tries to say 'sheep', it comes out 'keep'. And in a way Tom is right. Zip is always bringing things home for us to keep! I'll tell you about some of them. Zip's first present was a shoe. It was made of green silk. We didn't know how Zip found the shoe. But after a moment Mary, my big sister, told me the shoe had a strange smell. I nodded (点头) and held my nose. 'What do you think it is?' 'It smells like something for cleaning. I think someone tried to clean a spot (污点) off the shoe. Then he put it at the door to dry.' I said. 'We should take it back.' 'We can't,' said my sister. 'I know we can't,' I said.'We don't know where Zip found it.' 'Maybe little Tom is right,' Mary said. 'Maybe Zip is a keep dog!' 1. The writer and Mary didn't know _____. [     ] A. what Zip's first present was B. how Zip carried its first present home C. who owned Zip's first present D. what Zip's first present was made of 2. Tom calls Zip 'the keep dog' because _____. [     ] A. the dog likes keeping things B. the dog likes playing with shoes C. he doesn't know the dog's name D. he can't pronounce the word'sheep' well 3. What made the shoe strange was _____. [     ] A. its color B. its smell C. its size D. that it was a silk one 4. The word 'keep' in the last sentence means '_____'. [     ] A. keeping things for itself B. bringing things for others to keep C. not letting it run about D. taking care of a small child. 5. We can know from the reading that the dog _____. [     ] A. likes to give presents to people B. has been kept in at the writer's home C. has brought some trouble D. likes to be called 'the keep dog'