关于白喉的流行病学，以下说法正确的是（）。
A.白喉患者为最重要的传染源
B.主要通过呼吸道空气传播，染菌的衣物、用具等不会传染
C.病后可获终身免疫
D.常在春夏季节发病
E.多发生于学龄儿童，以7～10岁儿童发病率最高
参考答案：C
解析：人是白喉仅有的自然宿主，患者在潜伏期末即有传染性，传染期一般为1～2周，偶见恢复期后带菌6个月以上者，健康带菌者一般占人口的1%，流行时可达10%～20%。带菌者为最重要的传染源。白喉主要通过呼吸道空气传播，其次为通过使用染菌的衣物、用具、食具、玩具及书本等发生间接传染。白喉病后可获终身免疫。常在秋冬和春季发病，多发生于学龄前儿童，以2～5岁儿童发病率最高。
根据短文内容完成表格（5分） I am Alice. Welcome to my mew school. It is a big and beautiful school. Let me tell you something about it. This is our teaching building. And there are two grades and twenty classes. I’m in Class Two , Grade Seven. There are 20 girls and 17 boys in my class. There are some school offices in the building, too. In front of the building is the library. I read books in it every day. It has got three thousand books. Next to the library is the science lab. I like it very much. There is a gym next to the teaching building. You can play basketball , swim and play tennis there. Our piano room is next to the teaching building. I have a friend. Her name is Han Mei. She can play the piano very well. In front of the piano room is the dining hall. We often have lunch there. Behind the teaching building and the piano room are a big playground and a big garden. We often hold sports meeting and play football on the playground. I like my school very much.
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