听力原文：M: Great to see you back from Canada. What impressed you most about Canadian culture? W: It's not the Canadian culture but the culture shock is unbearable. M：What do you mean by culture shock? W：Culture shock is caused by the anxiety that results from losing all our familiar signs and symbols of social communication. M: Being more specific, what is that? W: When an individual enters a strange culture, all or most of these familiar signs are removed. He or she is like a fish out of water. A series of props have been knocked out from under him, followed by a feeling of frustration and anxiety. M: What are people's reactions? W: People react to the frustration in much the same way. They reject the environment, which causes the discomfort. The home environment suddenly assumes a tremendous importance. All the difficulties and problems are forgotten and only the good things back home are remembered. It usually takes a trip home to bring one back to reality. That's why I'm back. M: It's like an illness. W: Yes. M: Any other symptoms? W: Excessive concern over drinking water, food and bedding fear of physical contact with others, the absent-minded stare a feeling of helplessness and a desire for dependence on long-term residents of one's own nationality fits of anger over minor frustration and finally, that terrible longing to be back at home. W: What is the reason for all of this? M: This evidently grows out of the real difficulties, which the visitor experiences in the process of adjustment. There are house troubles, transportation troubles and shopping troubles. W: I bet everyone comes across some difficulty. M: If people succeed in getting more knowledge of the language and begin to get around by themselves, they are beginning to open the way into the new cultural environment. W: Have you got it? M: Hard to say. Q. 27. What is the cause of culture shock that a person must experience in a foreign country? Q. 28.Which of the following is NOT a sign of culture shock? Q. 29.Which of the following is NOT a symptom of a person who experiences culture shock? Q. 30.What can we infer from the conversation? (47)