I sat with my friend in a well-known coffee shop in Venice. As we enjoyed our coffee, a man entered and sat at an empty table beside us. He called the waiter and placed his order saying, "Two cups of coffee, one of them on the wall."

    As soon as he left, the waiter posted a piece of paper on the wall saying "A Cup of Coffee". A few minutes later, two other men entered and ordered three cups of coffee, two on the table and one on the wall. They had two cups of coffee but paid for three and left. This time also, the waiter did the same; he posted a piece of paper on the wall saying, "A Cup of Coffee". It seemed that this gesture was quite normal here. However, it was something unique and puzzling us. When we finished our coffee, we paid the bill and left.

    After a few days, we went to this coffee shop again. While we were enjoying our coffee, a man entered. The way this man was dressed did not match the standard nor the atmosphere of this coffee shop. Poverty was obvious from the looks on his face. As he seated himself, he looked at the wall and said, "One cup of coffee from the wall." The waiter served coffee to this man with the customary respect and dignity. The man had his coffee and left without paying. We were amazed to watch all this when the waiter took off a piece of paper from the wall and threw it in the dustbin.

Now it was no surprise for us. The great respect for the needy shown by the inhabitants of this town welled up our eyes with tears.

    In the early 1990s, Staffan Lindeberg from Lund University in Sweden travelled to Papua New Guinea to study the diet (饮食) of the people on the island of Kitava as this was very close to the Stone Age diet, that is, the food people ate many thousands of years ago before humans started farming. While there, he found that the people did not suffer from heart attacks, diabetes (糖尿病), being overweight and many other diseases common in western countries.

    As a result of his findings, he decided to test patients in Sweden to see how such a diet would influence them. Fourteen patients followed a Stone Age diet while another fifteen followed a Mediterranean diet. All of the patients in the tests had high blood sugar levels, most suffered from diabetes and they all had some problems with their hearts.

    At the end of three  months, the group following the Mediterranean diet had reduced (减少) their blood sugar levels by a small amount but those following the Stone Age diet had much lower levels of sugar in their blood. The patients in both groups also lost weight although the level of sugar in the blood and the patients' weight didn't seem to be related.

    So, what is it about the Stone Age diet that can make us healthier? The diet contains (包含) some meat, fish,  fruit, vegetables and nuts but it doesn't contain any dairy products or grains (牛奶制品和谷物), such as wheat or rice,  and there is no salt.

    The next question is whether the Kitavan people are healthier than us. According to Professor Lindeberg, this is not as simple as we may think. Because of not having enough healthcare, there is more chance of them dying at a young age. However,   if people on Kitava manage to reach fifty, they might live as long as people in more developed countries.

    Culture shock has many stages. Each stage can appear only at certain times. In the first stage, everything is new and exciting. New arrivals may be pleased by all the new things around them.

    Afterwards, the second stage presents itself. A person may go through some difficult times in daily life.  This happens when a person is trying to fit in with a new culture. It is a difficult process and takes time to complete.

    The third stage is featured by gaining some understanding of the new culture. The new arrival may not feel lost any more. The person begins to learn more about the new culture and wants to belong to it.

    In the fourth stage, the person gradually realizes that the new culture has good and bad things to offer. This process is often accompanied (伴随) by a much stronger feeling of belonging.

    The fifth stage is the stage that is called the "re­entry shock". One may find that things are no longer the same. For example, some of the newly acquired customs are not in use in the old culture.

    These stages are present at different times and each person has his/her own way of reacting in the stages of culture shock. As a result, some stages will be longer and more difficult than others.

A．This time is called the "honeymoon" stage.

B．The person starts to establish goals for living.

C．Luckily, this often comes to an end fairly soon.

D．A new feeling of pleasure may be experienced.

E．Communicating with others is a good way to start.

F．This happens when a return to the homeland is made.

G．In this stage, there may be feelings of sadness and helplessness.