阅读理解，判断正误。(正确的标T，错误的标F) In the front of many American homes you can see a mat (脚垫).This mat is sometimes called 'welcome mat',because many of the mats ha ve the word 'welcome' on them. Because Americans don't take off their shoes before going into the house,they need a welcome mat to clean their shoes.If the children don't clean their shoes on the mat,they may be scolded (被责骂) by their parents.If you go to an American home,pleas e remember to clean your shoes on the mat,or you may be told to do so.'Different countries,different customs(习俗).' (     )1. There are many 'welcome mats' in the front of an American home. (     )2. Every American home has a welcome mat. (     )3. When Americans go into the house,they often take off their shoes. (     )4. It's better to clean your shoes before you go into an American home. (     )5. There are different customs in different countries.