阅读理解。 Mr Smith lives in Toronto. He's a doctor. His wife teaches English in a middle school. They have two children.  One is a son called Mike and the other is a daughter. She's only three months old. Mike loves the baby very much. He often shows her to their guests(客人). Mike is young and doesn't go to school. He stays at home to help his mother look af ter the baby. One day Mike's aunt comes to see the baby. She works in another city and sees the baby for the first time. Mike shows the baby to his aunt. 'Look at the baby, aunt,' says Mike. 'She is beautiful.  I think she looks like me ! ' 'Does she like playing with you?' asks his aunt. 'I don't know:' answers the boy, 'She can't speak yet. ' 1. Mike is _____. A. an American B. an Australian C. an Englishman D. a Canadian 2. There're _____ people in Mr Smith's family. A. two B. four C: five D. six 3. Mrs Smith is a _____. A. doctor B. worker C. teacher D. bookseller 4. The baby is Mike's _____. A. elder sister B. younger sister C. elder brother D. younger brother 5. Little Mike thinks _____. A. he's beautiful, too B. the baby is nice C. his aunt is friendly to him D. he loves the baby best