仔细阅读，选择正确答案。

　　Dear Sir,

　　I have to travel every day from Souk Road to the airport．Two buses travel along the line：the number 49 and number 16．But by the time the number 16 bus gets to Souk Road, it is always full, so I can't get on it．I have to wait for the number 49, because sometimes there are empty seats on it．

　　The timetable says that there are buses from Souk Road to the airport every ten minutes．If this is so, why do I have to wait half an hour for a bus every day?

　　The regulations(规章)say that if there are empty seats on a bus, the bus must stop at every stop where people are waiting．Why do the half-empty buses go straight past me when I am standing at the bus stop?

　　The regulations say that no bus may carry more than 40 seated passengers(乘客)and 20 standing passengers．Yesterday I was the first to get off the bus when it reached the airport．I counted(数)the other passengers as they got off．There were 129 of them．

　　It is clear that our bus companies break the regulations and think little of their passengers．Can nothing be done to make your service(服务)better?

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阅读理解，根据短文内容从各题的四个选项中选择一个最佳答案

　　You probably got your first baby tooth when you were around six months old．And all of 20 lf your primary teeth, or baby teeth, were probably in place by the time you reached the age of three．Then a funny thing happened．When you were about six or seven, your primary teeth began to fall out．

　　So what's the point of having these little teeth? Well, the main job of baby teeth is to hold a place in your mouth for your permanent teeth(恒牙), or grown-up teeth．If a baby tooth is lost too early, the teeth beside it may move into that space．Then your permanent teeth may come in crooked(歪的)or crowded．

　　When a permanent tooth starts to come in, it pushes on the root of the primary tooth above it．Your primary tooth gets loose(松动的), and soon you have a new hole in your smile．In fact, you may be open-mouthed and looking for your latest loose tooth…

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