单选题 .  If you travel around the world, you will be surprised to find that foreign customs can be different     1    your own. A visitor to India would do well to remember that people there     2    it impolite to use the left hand     3    passing food at table. The left hand is supposed to be     4    for washing yourself. Also in India, you might     5    a man shaking his head at another and     6    that he is disagreeing. But in many     7    of India a shake of the head is a     8    that shows agreement or acceptance. Nodding your head when you are offered a     9    in Bulgaria is likely to leave you thirsty. In that country you shake your head to mean "yes" and a nod means "no". The Arabs are     10    for their hospitality (好客). At a meal in the Arabic countries, you will     11    that any drinking vessel(器皿) is filled again     12    again as soon as you drink it up. The way to     13    that you have had enough is to take the cup or glass in your hand and give it a little shake from side to side or place your hand     14    the top.
    In Europe it is quite usual to     15    your legs when sitting talking to someone, even at an important meeting. Doing this when meeting an important person in Thailand, however, could     16    him or her unhappy. It is considered too informal an attitude for such     17    occasion. Also when in Thailand you are     18    supposed to touch the head of an adult—it's just not done. In Japan, it is quite usual for     19    to plan evening entertainment for themselves and leave their wives at home. In Europe much attitudes are disappearing.
    Customs vary from country to     20    . Visitors may be at a loss as to what to do in a foreign environment. In such circumstances, the rule is: When in Rome, do as the Romans do.1.