B. Chlorophyll and the Fall Leaf Colors

　　C. Why Do Leaves Change Color in Fall?

　　D. How Do Trees’ Food Factories Work?

　　D

　　In England three foreign gentlemen came to a bus stop. They studied the information on the post sign and decided which bus to take. About five minutes later the bus they wanted came along. They prepared to get on. Suddenly people rushed onto the bus and tried to push them out of the way. Someone shouted insulting words about the foreigners. The bus conductor came rushing down the stairs to see what all the trouble was about. The three foreign gentlemen looked puzzled and ashamed. No one had told them about the British custom of lining up for a bus so that the first person who arrived at a bus-stop is the first person to get on the bus.

　　Learning the language of a country isn’t enough. If you want to ensure a pleasant visit, find out as much as possible about the manners and customs of your hosts. You will probably be surprised just how different they can be from your own. A visitor to India would do well to remember that people there consider it impolite to use the left hand for passing food at table. The left hand should be used for washing yourself. Also in India, You might see a man apparently shaking his head at another and consider that he is disagreeing. But in many parts of India shaking one’s head means expressing agreement. Nodding your head when offered a drink in Bulgaria is likely to leave you thirsty. In that country you shake your head to express “yes” — a nod means “no”.

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