Many cultures have different ideas about why people catch colds. For Example, in the United States, some people think that you catch cold if your (11) get cold. So, mothers tell small children to wear (12) boots(靴子) in the winter. In other places, including parts of the Middle East, some people believe that strong winds cause cold. So, on trains and buses, people usually don’’t like to sit (13) 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 (14), you should quickly put on dry clothes. Today scientists know that colds are caused by viruses(病毒). But the old ideas are still very strong, and many people still follow them to (15) getting ill.