Before you go to another country it is a great help if you know the language（语音） and some of the customs（风俗）of the country.
When people meet each other for the first time in Britain, they say “How do you do?” and shake hands(握手). Usually they do not shake hands when they just meet or say goodbye. But they shake hands when they haven’t met for a long time or when they will be away from each other for a long time.
Last year a group of German students went to England for a holiday. Their teacher told them that the English people hardly ever shake hands. So when they met their English friends at the station, they kept their hands behind their backs. The English students had learned that the Germans shake hands as often as possible, so they put their hands in front and got ready to shake hands with them. It made both of them laugh.
小题1:It is _____ if you know the language and some of the customs of a country before you pay a visit to that country.
A．not useful
B．not helpful
C．very helpful
D．very bad小题2:English people usually shake hands when they ______.
A．meet every time
B．meet for the first time
C．say goodbye to each other
D．say hello to each other小题3:Usually, English people don’t shake hands _____.
A．when they will be away for a long time
B．when they say “How do you do?”
C．when they just meet or say goodbye
D．when they haven’t met for a long time小题4:Which is right?
A．German people shake hands as often as possible.
B．English people like shaking hands very much
C．German people hardly ever shake hands.
D．Both English people and Germans don’t like shaking hands.小题5:This story is about _____.
A．shaking hands
B．languages
C．customs
D．languages and customs
）在常温常压下为无色可燃性气体，微溶于水，可溶于乙醇、乙醚等，主要存在于天然气、炼厂气和裂解气中，经物理分离而获得，亦可由正丁烷经异构化制得。它主要用于与异丁烯反应制异辛烷，作为汽油辛烷值的改进剂，也可用作冷冻剂。
(X表示卤素；R表示烷基或氢原子) 
