阅读理解。 Many cultures have different ideas about why people catch colds. For example, in the United States, some people think that you can catch a cold if your feet get cold. So mothers tell small children to wear warm boots in the winter. In other places, including parts of the Middle East, some people believe that strong winds cause colds. So, on trains and buses, people usually don’t like to sit next to open windows. In parts of Europe, some people think that wearing wet clothes will give you a cold. They say that after you go swimming, you should quickly put on dry clothes. Today, scientists know that colds are caused by a virus (病毒). But the old ideas are still very strong, and many people still follow them to avoid (避免) getting ill. 1. In the United States, people think you can catch a cold if ______________________. A. you wear wet clothes B. you sit next to the windows C. your feet get cold D. you go swimming in summer 2. Which is NOT a cause(成因)of colds in the reading? A. bad food B. wet clothes C. a virus D. strong winds 3. In“ people still follow them to avoid getting ill ”, what does “them” mean ? A. scientists B. old ideas C. colds D. dry clothes 4. What is the main (主要的) idea of this reading? A. You should take good care of your health in winter. B. Colds are the biggest health problem in the world. C. Some people think that strong winds cause colds. D. People still believe old ideas about why they catch colds.